文本為投稿文章，作者：Jekyll
Masonry是一個輕量級的布局框架，擁有自己的描述語法，采用更優雅的鏈式語法封裝自動布局，簡潔明了並具有高可讀性，而且同時支持 iOS 和 Max OS X。Masonry是一個用代碼寫iOS或OS界面的庫，可以代替Auto layout。Masonry的github地址：https://github.com/SnapKit/Masonry

本章內容

- Masonry配置

- Masonry使用

- Masonry實例

Masonry配置

- 推薦使用pods方式引入類庫，pod 'Masonry'，若不知道pod如何使用，情況我的另一篇文章： 提高ios開發效率的工具

- 引入頭文件 #import "Masonry.h"

Masonry使用講解

mas_makeConstraints 是給view添加約束，約束有幾種，分別是邊距，寬，高，左上右下距離，基准線。添加過約束後可以有修正，修正有offset（位移）修正和multipliedBy（倍率）修正。

語法一般是 make.equalTo or make.greaterThanOrEqualTo or make.lessThanOrEqualTo + 倍數和位移修正。

注意點1： 使用 mas_makeConstraints方法的元素必須事先添加到父元素的中，例如[self.view addSubview:view];

注意點2： masequalTo 和 equalTo 區別：masequalTo 比equalTo多了類型轉換操作，一般來說，大多數時候兩個方法都是 通用的，但是對於數值元素使用mas_equalTo。對於對象或是多個屬性的處理，使用equalTo。特別是多個屬性時，必須使用equalTo,例如 make.left.and.right.equalTo(self.view);

注意點3: 注意到方法with和and,這連個方法其實沒有做任何操作，方法只是返回對象本身，這這個方法的左右完全是為了方法寫的時候的可讀性 。make.left.and.right.equalTo(self.view);和make.left.right.equalTo(self.view);是完全一樣的，但是明顯的加了and方法的語句可讀性 更好點。

Masonry初級使用例子

// exp1: 中心點與self.view相同，寬度為400*400
-(void)exp1{
    UIView *view = [UIView new];
    [view setBackgroundColor:[UIColor redColor]];
    [self.view addSubview:view];
    [view mas_makeConstraints:^(MASConstraintMaker *make) {
         make.center.equalTo(self.view);
         make.size.mas_equalTo(CGSizeMake(400,400));
    }];
}
//exp2: 上下左右邊距都為10
-(void)exp2{
    UIView *view = [UIView new];
    [view setBackgroundColor:[UIColor redColor]];
    [self.view addSubview:view];
    [view mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self.view).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
        //  make.left.equalTo(self.view).with.offset(10);
        //  make.right.equalTo(self.view).with.offset(-10);
        //  make.top.equalTo(self.view).with.offset(10);
        //  make.bottom.equalTo(self.view).with.offset(-10);
    }];
}
//exp3 讓兩個高度為150的view垂直居中且等寬且等間隔排列 間隔為10
-(void)exp3{
    UIView *view1 = [UIView new];
    [view1 setBackgroundColor:[UIColor redColor]];
    [self.view addSubview:view1];
    UIView *view2 = [UIView new];
    [view2 setBackgroundColor:[UIColor redColor]];
    [self.view addSubview:view2];
    [view1 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.mas_equalTo(self.view.mas_centerY);
        make.height.mas_equalTo(150);
        make.width.mas_equalTo(view2.mas_width);
        make.left.mas_equalTo(self.view.mas_left).with.offset(10);
        make.right.mas_equalTo(view2.mas_left).offset(-10);
    }];
    [view2 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.mas_equalTo(self.view.mas_centerY);
        make.height.mas_equalTo(150);
        make.width.mas_equalTo(view1.mas_width);
        make.left.mas_equalTo(view1.mas_right).with.offset(10);
        make.right.equalTo(self.view.mas_right).offset(-10);
    }];
}

Masonry高級使用例子1

iOS計算器使用Masorny布局：

//高級布局練習 ios自帶計算器布局
-(void)exp4{
    //申明區域，displayView是顯示區域，keyboardView是鍵盤區域
    UIView *displayView = [UIView new];
    [displayView setBackgroundColor:[UIColor blackColor]];
    [self.view addSubview:displayView];
    UIView *keyboardView = [UIView new];
    [self.view addSubview:keyboardView];
    //先按1：3分割 displView（顯示結果區域）和 keyboardView（鍵盤區域）
    [displayView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view.mas_top);
        make.left.and.right.equalTo(self.view);
        make.height.equalTo(keyboardView).multipliedBy(0.3f);
    }];
    [keyboardView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(displayView.mas_bottom);
        make.bottom.equalTo(self.view.mas_bottom);
        make.left.and.right.equalTo(self.view);
    }];
    //設置顯示位置的數字為0
    UILabel *displayNum = [[UILabel alloc]init];
    [displayView addSubview:displayNum];
    displayNum.text = @"0";
    displayNum.font = [UIFont fontWithName:@"HeiTi SC" size:70];
    displayNum.textColor = [UIColor whiteColor];
    displayNum.textAlignment = NSTextAlignmentRight;
    [displayNum mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.and.right.equalTo(displayView).with.offset(-10);
        make.bottom.equalTo(displayView).with.offset(-10);
    }];
    //定義鍵盤鍵名稱，？號代表合並的單元格
    NSArray *keys = @[@"AC",@"+/-",@"%",@"÷"
                     ,@"7",@"8",@"9",@"x"
                     ,@"4",@"5",@"6",@"-"
                     ,@"1",@"2",@"3",@"+"
                     ,@"0",@"?",@".",@"="];
    int indexOfKeys = 0;
    for (NSString *key in keys){
        //循環所有鍵
        indexOfKeys++;
        int rowNum = indexOfKeys %4 ==0? indexOfKeys/4:indexOfKeys/4 +1;
        int colNum = indexOfKeys %4 ==0? 4 :indexOfKeys %4;
        NSLog(@"index is:%d and row:%d,col:%d",indexOfKeys,rowNum,colNum);
        //鍵樣式
        UIButton *keyView = [UIButton buttonWithType:UIButtonTypeCustom];
        [keyboardView addSubview:keyView];
        [keyView setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [keyView setTitle:key forState:UIControlStateNormal];
        [keyView.layer setBorderWidth:1];
        [keyView.layer setBorderColor:[[UIColor blackColor]CGColor]];
        [keyView.titleLabel setFont:[UIFont fontWithName:@"Arial-BoldItalicMT" size:30]];
        //鍵約束
        [keyView mas_makeConstraints:^(MASConstraintMaker *make) {
            //處理 0 合並單元格
            if([key isEqualToString:@"0"] || [key isEqualToString:@"?"] ){
                if([key isEqualToString:@"0"]){
                    [keyView mas_makeConstraints:^(MASConstraintMaker *make) {
                        make.height.equalTo(keyboardView.mas_height).with.multipliedBy(.2f);
                        make.width.equalTo(keyboardView.mas_width).multipliedBy(.5);
                        make.left.equalTo(keyboardView.mas_left);
                        make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.9f);
                    }];
                }if([key isEqualToString:@"?"]){
                    [keyView removeFromSuperview];
                }
            }
            //正常的單元格
            else{
                make.width.equalTo(keyboardView.mas_width).with.multipliedBy(.25f);
                make.height.equalTo(keyboardView.mas_height).with.multipliedBy(.2f);
                //按照行和列添加約束，這裡添加行約束
                switch (rowNum) {
                    case 1:
                    {
                        make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.1f);
                        keyView.backgroundColor = [UIColor colorWithRed:205 green:205 blue:205 alpha:1];
                    }
                        break;
                    case 2:
                    {
                        make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.3f);
                    }
                        break;
                    case 3:
                    {
                        make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.5f);
                    }
                        break;
                    case 4:
                    {
                        make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.7f);
                    }
                        break;
                    case 5:
                    {
                        make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.9f);
                    }
                        break;
                    default:
                        break;
                }
                //按照行和列添加約束，這裡添加列約束
                switch (colNum) {
                    case 1:
                    {
                        make.left.equalTo(keyboardView.mas_left);
                    }
                        break;
                    case 2:
                    {
                        make.right.equalTo(keyboardView.mas_centerX);
                    }
                        break;
                    case 3:
                    {
                        make.left.equalTo(keyboardView.mas_centerX);
                    }
                        break;
                    case 4:
                    {
                        make.right.equalTo(keyboardView.mas_right);
                        [keyView setBackgroundColor:[UIColor colorWithRed:243 green:127 blue:38 alpha:1]];
                    }
                        break;
                    default:
                        break;
                }
            }
        }];
    }
}

本例子使用的baseline去控制高度位置，這似乎不是太准，如果想要精准控制高度位置，可以使用一行一行添加的方法，每次當前行的top去equelTo上一行的bottom。 給個提示：

for（遍歷所有行)
    for（遍歷所以列）
    //當前行約束根據上一行去設置
    ......

下一個例子中，使用上面類似的方法

Masonry高級使用例子2

根據設計圖，使用masonry布局：

步驟1

步驟2

步驟1

 -(void)createUI{
    UIView *titleView = [UIView new];
    titleView.backgroundColor = [UIColor redColor];
    UIView *caredView = [UIView new];
    [self.view addSubview:caredView];
    UIView *brifeView = [UIView new];
    [self.view addSubview:brifeView];
    //self.view
    self.view.backgroundColor = [UIColor colorWithWhite:0.965 alpha:1.000];
    //thrm
    UIImageView *plantThrm = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"defalutPlantReferenceIcon"]];
    [self.view addSubview:plantThrm];
    [plantThrm mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.and.top.equalTo(self.view).with.offset(10);
    }];
    //title
       [self.view addSubview:titleView];
       UIImageView *bgTitleView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"bg-plant-reference-title"]];
    [titleView addSubview:bgTitleView];
    [titleView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.view.mas_right);
        make.left.equalTo(plantThrm.mas_right).with.offset(20);
        make.centerY.equalTo(plantThrm.mas_centerY);
   }];
    [bgTitleView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(titleView);
    }];
    UILabel *title = [[UILabel alloc]init];
    title.textColor =  [UIColor whiteColor];
    title.font = [UIFont fontWithName:@"Heiti SC" size:26];
    title.text = _reference.name;
    [titleView addSubview:title];
    [title mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(titleView.mas_left).offset(10);
        make.width.equalTo(titleView.mas_width);
        make.centerY.equalTo(titleView.mas_centerY);
    }];
    //植物養護
    UILabel *caredTitle = [[UILabel alloc]init];
    caredTitle.textColor =  [UIColor colorWithRed:0.172 green:0.171 blue:0.219 alpha:1.000];
    caredTitle.font = [UIFont fontWithName:@"Heiti SC" size:10];
    caredTitle.text = @"植物養護";
    [self.view addSubview:caredTitle];
    [caredTitle mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(plantThrm.mas_bottom).with.offset(20);
        make.left.and.right.equalTo(self.view).with.offset(10);
        make.height.mas_equalTo(10);
    }];
    //將圖層的邊框設置為圓腳
    caredView.layer.cornerRadius = 5;
    caredView.layer.masksToBounds = YES;
    //給圖層添加一個有色邊框
    caredView.layer.borderWidth = 1;
    caredView.layer.borderColor = [[UIColor colorWithWhite:0.521 alpha:1.000] CGColor];
    caredView.backgroundColor = [UIColor whiteColor];
    [caredView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(caredTitle.mas_bottom).with.offset(5);
        make.left.equalTo(self.view.mas_left).with.offset(10);
        make.right.equalTo(self.view.mas_right).with.offset(-10);
        make.height.equalTo(brifeView);
    }];
    //植物簡介
    UILabel *brifeTitle = [[UILabel alloc]init];
    brifeTitle.textColor =  [UIColor colorWithRed:0.172 green:0.171 blue:0.219 alpha:1.000];
    brifeTitle.font = [UIFont fontWithName:@"Heiti SC" size:10];
    brifeTitle.text = @"植物簡介";
    [self.view addSubview:brifeTitle];
    [brifeTitle mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(caredView.mas_bottom).with.offset(20);
        make.left.and.right.equalTo(self.view).with.offset(10);
        make.height.mas_equalTo(10);
    }];
    //將圖層的邊框設置為圓腳
    brifeView.layer.cornerRadius = 5;
    brifeView.layer.masksToBounds = YES;
    //給圖層添加一個有色邊框
    brifeView.layer.borderWidth = 1;
    brifeView.layer.borderColor = [[UIColor colorWithWhite:0.521 alpha:1.000] CGColor];
    brifeView.backgroundColor = [UIColor whiteColor];
    [brifeView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(brifeTitle.mas_bottom).with.offset(5);
        make.left.equalTo(self.view.mas_left).with.offset(10);
        make.right.equalTo(self.view.mas_right).with.offset(-10);
        make.bottom.equalTo(self.view.mas_bottom).with.offset(-10);
        make.height.equalTo(caredView);
    }];
}

完成之後如下圖 步驟1

步驟2,在上面的基礎上，增加植物養護部分ui構造的代碼，思想是，先構造出四行，然後根據每行單獨構造出行樣式。

//把塊拆分為四行
-(void)createIndexUIWithView:(UIView *)view{
    //拆分四行
    UIView *row1 = [UIView new];
    UIView *row2 = [UIView new];
    UIView *row3 = [UIView new];
    UIView *row4 = [UIView new];
    [view addSubview:row1];
    [view addSubview:row2];
    [view addSubview:row3];
    [view addSubview:row4];
    [row1 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.and.left.equalTo(view);
        make.height.equalTo(view.mas_height).multipliedBy(0.25);
        make.top.equalTo(view.mas_top);
    }];
    [row2 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.and.left.equalTo(view);
        make.top.equalTo(row1.mas_bottom);
        make.height.equalTo(view.mas_height).multipliedBy(0.25);
    }];
    [row3 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(view.mas_right);
        make.top.equalTo(row2.mas_bottom);
        make.height.equalTo(view.mas_height).multipliedBy(0.25);
        make.left.equalTo(view.mas_left);
    }];
    [row4 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.and.left.equalTo(view);
        make.top.equalTo(row3.mas_bottom);
        make.height.equalTo(view.mas_height).multipliedBy(0.25);
    }];
    [self createIndexRowUI:PlantReferenceWaterIndex withUIView:row1];
    [self createIndexRowUI:PlantReferenceSumIndex withUIView:row2];
    [self createIndexRowUI:PlantReferenceTemperatureIndex withUIView:row3];
    [self createIndexRowUI:PlantReferenceElectrolyteIndex withUIView:row4];
}
//構造每行的UI
-(void)createIndexRowUI:(PlantReferenceIndex) index withUIView:(UIView *)view{
    //index標題
    UILabel *indexTitle = [UILabel new];
    indexTitle.font = [UIFont fontWithName:@"HeiTi SC" size:14];
    indexTitle.textColor = [UIColor colorWithWhite:0.326 alpha:1.000];
    [view addSubview:indexTitle];
    [indexTitle mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(view.mas_left).with.offset(20);
        make.centerY.equalTo(view.mas_centerY);
    }];
    switch (index) {
        case PlantReferenceWaterIndex:
        {
            indexTitle.text = @"水分";
            UIImageView * current;
            for(int i=1;i<=5;i++){
                if(i<_reference.waterIndex){
                    current = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_water_light"]];
                }else{
                    current = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_water_dark"]];
                }
                [view addSubview:current];
                //間距12%，左邊留空30%
                [current mas_makeConstraints:^(MASConstraintMaker *make) {
                    make.left.equalTo(view.mas_right).with.multipliedBy(0.12*(i-1) +0.3);
                    make.centerY.equalTo(view.mas_centerY);
                }];
            }
        }
              break;
        case PlantReferenceSumIndex:
        {
            indexTitle.text = @"光照";
            UIImageView * current;
            for(int i=1;i<=5;i++){
                if(i<_reference.temperatureIndex){
                    current = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_summer_light"]];
                }else{
                    current = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_summer_dark"]];
                }
                [view addSubview:current];
                //間距12%，左邊留空30%
                [current mas_makeConstraints:^(MASConstraintMaker *make) {
                    make.left.equalTo(view.mas_right).with.multipliedBy(0.12*(i-1) +0.3);
                    make.centerY.equalTo(view.mas_centerY);
                }];
            }
        }
              break;
        case PlantReferenceTemperatureIndex:
        {
            indexTitle.text = @"溫度";
            UIImageView * current;
            for(int i=1;i<=5;i++){
                if(i<_reference.sumIndex){
                    current = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_temperature_light"]];
                }else{
                    current = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_temperature_dark"]];
                }
                [view addSubview:current];
                //間距12%，左邊留空30%
                [current mas_makeConstraints:^(MASConstraintMaker *make) {
                    make.left.equalTo(view.mas_right).with.multipliedBy(0.12*(i-1) +0.3);
                    make.centerY.equalTo(view.mas_centerY);
                }];
            }
        }
              break;
        case PlantReferenceElectrolyteIndex:
        {
            indexTitle.text = @"肥料";
            UIImageView * current;
            for(int i=1;i<=5;i++){
                if(i<_reference.electrolyteIndex){
                    current = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_electolyte_light"]];
                }else{
                    current = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_electolyte_dark"]];
                }
                [view addSubview:current];
                //間距12%，左邊留空30%
                [current mas_makeConstraints:^(MASConstraintMaker *make) {
                    make.left.equalTo(view.mas_right).with.multipliedBy(0.12*(i-1) +0.3);
                    make.centerY.equalTo(view.mas_centerY);
                }];
            }
        }
            break;
        default:
            break;
    }
}
//在步驟1createui的基礎上，做了一些微調。
-(void)createUI{
    self.title = _reference.name;
    UIView *titleView = [UIView new];
    UIView *caredView = [UIView new];
    [self.view addSubview:caredView];
    UITextView *brifeView = [UITextView new];
    [self.view addSubview:brifeView];
    //self.view
    self.view.backgroundColor = [UIColor colorWithWhite:0.965 alpha:1.000];
    //thrm
    UIImageView *plantThrm = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"defalutPlantReferenceIcon"]];
    [self.view addSubview:plantThrm];
    [plantThrm mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.and.top.equalTo(self.view).with.offset(10);
    }];
    //title
       [self.view addSubview:titleView];
       UIImageView *bgTitleView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"bg-plant-reference-title"]];
    [titleView addSubview:bgTitleView];
    [titleView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.view.mas_right);
        make.left.equalTo(plantThrm.mas_right).with.offset(20);
        make.centerY.equalTo(plantThrm.mas_centerY);
   }];
    [bgTitleView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(titleView);
    }];
    UILabel *title = [[UILabel alloc]init];
    title.textColor =  [UIColor whiteColor];
    title.font = [UIFont fontWithName:@"Heiti SC" size:26];
    title.text = _reference.name;
    [titleView addSubview:title];
    [title mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(titleView.mas_left).offset(10);
        make.width.equalTo(titleView.mas_width);
        make.centerY.equalTo(titleView.mas_centerY);
    }];
    //植物養護
    UILabel *caredTitle = [[UILabel alloc]init];
    caredTitle.textColor =  [UIColor colorWithRed:0.172 green:0.171 blue:0.219 alpha:1.000];
    caredTitle.font = [UIFont fontWithName:@"Heiti SC" size:10];
    caredTitle.text = @"植物養護";
    [self.view addSubview:caredTitle];
    [caredTitle mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(plantThrm.mas_bottom).with.offset(20);
        make.left.and.right.equalTo(self.view).with.offset(10);
        make.height.mas_equalTo(10);
    }];
    //植物養護 數據
    [self createIndexUIWithView:caredView];
    //將圖層的邊框設置為圓腳
    caredView.layer.cornerRadius = 5;
    caredView.layer.masksToBounds = YES;
    //給圖層添加一個有色邊框
    caredView.layer.borderWidth = 1;
    caredView.layer.borderColor = [[UIColor colorWithWhite:0.521 alpha:1.000] CGColor];
    caredView.backgroundColor = [UIColor whiteColor];
    [caredView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(caredTitle.mas_bottom).with.offset(5);
        make.left.equalTo(self.view.mas_left).with.offset(10);
        make.right.equalTo(self.view.mas_right).with.offset(-10);
        make.height.equalTo(brifeView);
    }];
    //植物簡介
    UILabel *brifeTitle = [[UILabel alloc]init];
    brifeTitle.textColor =  [UIColor colorWithRed:0.172 green:0.171 blue:0.219 alpha:1.000];
    brifeTitle.font = [UIFont fontWithName:@"Heiti SC" size:10];
    brifeTitle.text = @"植物簡介";
    [self.view addSubview:brifeTitle];
    [brifeTitle mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(caredView.mas_bottom).with.offset(20);
        make.left.and.right.equalTo(self.view).with.offset(10);
        make.height.mas_equalTo(10);
    }];
    //將圖層的邊框設置為圓腳
    brifeView.layer.cornerRadius = 5;
    brifeView.layer.masksToBounds = YES;
    //給圖層添加一個有色邊框
    brifeView.layer.borderWidth = 1;
    brifeView.layer.borderColor = [[UIColor colorWithWhite:0.447 alpha:1.000] CGColor];
    brifeView.backgroundColor = [UIColor whiteColor];
    //文字樣式
//    brifeView.textColor = [UIColor colorWithWhite:0.352 alpha:1.000];
//    brifeView.font = [UIFont fontWithName:@"HeiTi SC" size:12];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    paragraphStyle.lineHeightMultiple = 20.f;
    paragraphStyle.maximumLineHeight = 25.f;
    paragraphStyle.minimumLineHeight = 15.f;
    paragraphStyle.alignment = NSTextAlignmentJustified;
    NSDictionary *attributes = @{ NSFontAttributeName:[UIFont systemFontOfSize:12], NSParagraphStyleAttributeName:paragraphStyle, NSForegroundColorAttributeName:[UIColor colorWithWhite:0.447 alpha:1.000]};
    //植物簡介數據
    //brifeView.text = _reference.brief;
    brifeView.attributedText = [[NSAttributedString alloc] initWithString: _reference.brief attributes:attributes];
    [brifeView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(brifeTitle.mas_bottom).with.offset(5);
        make.left.equalTo(self.view.mas_left).with.offset(10);
        make.right.equalTo(self.view.mas_right).with.offset(-10);
        make.bottom.equalTo(self.view.mas_bottom).with.offset(-10);
        make.height.equalTo(caredView);
    }];
}

完成之後如下圖 步驟2