1:contentSize、contentInset和contentOffset區別 contentSize 是scrollview中的一個屬性,它代表scrollview中的可顯示區域,假如有一個scrollview,它的frame為(0,0,320,480),而它的contentSize為(320,960).也就是說,這個scrollview整個內容的大小為(320,960),要通過上下滑動scrollview來查看(320,480)後的內容。 contentOffset 是scrollview當前顯示區域頂點相對於frame頂點的偏移量,比如上個例子你拉到最下面,contentoffset就是(0 ,-480),也就是y偏移了480 contentInset 是scrollview中contentView.frame.origin與scrollview.frame.origin的關系,比如contentView的frame為(0,30,320,480),那麼contentInset則為(0, 30),它也可以設置上下左右 2:IOS虛擬器安裝其它Simulator 下載後的dmg安裝.這裡主要以iOS7.0模擬器的離線安裝為例進行說明,其他版本以此類推: 下載ios_7_0_simulator.dmg後打開dmg文件,可以看到安裝包iPhoneSimulatorSDK7_0.pkg,使用安裝器安裝此安裝包,默認會安裝在所選分區的/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk目錄下,完全退出Xcode後將剛才安裝的iPhoneSimulator7.0.sdk整個目錄復制或移動到/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs目錄下即可,(Xcode.app右鍵可以"顯示包內容“)重新啟動Xcode一般就可以使用相應版本的模擬器進行開發和調試了。 離線安裝還有一個簡單的辦法就是將以前安裝過的舊版本的Xcode如Xcode5.0.2下面已經安裝好了的iOS模擬器直接復制過來使用,目錄位置都一樣,都是在Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs裡面。這樣就不用再下載離線安裝包了。 3:輸入框中的inputaccessoryview和inputview UITextFields和UITextView有一個inputAccessoryView的屬性,當你想在鍵盤上展示一個自定義的view時,你就可以設置該屬性。你設置的view就會自動和鍵盤keyboard一起顯示了。需要注意的是,你所自定義的view既不應該處在其他的視圖層裡,也不應該成為其他視圖的子視圖。其實也就是說,你所自定義的view只需要賦給屬性inputAccessoryView就可以了,不要再做其他多余的操作。 inputview則是鍵盤視圖,當其為nil時則彈出的是系統默認的鍵盤; 實例一(給鍵盤上方設置一個工具條的方式): - (void)createKeyboardTool { keyboardTool = [[UIToolbar alloc] initWithFrame: CGRectMake(kZero, kZero, kScreenW, 44.0f)]; NSMutableArray *myToolBarItems = [NSMutableArray array]; //創建鍵盤工具條上面的按鈕,並設置點擊事件 UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemReply target:self action:@selector(cancelAction)]; UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:@selector(saveAction)]; UIBarButtonItem *saveBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(saveAction)]; [myToolBarItems addObject:cancelBtn]; [myToolBarItems addObject:space]; [myToolBarItems addObject:saveBtn]; keyboardTool.items = myToolBarItems; } //inputAccessoryView:設置鍵盤頂部顯示的工具條;inputView:自定義鍵盤 commentTextView = [[UITextView alloc]initWithFrame:CGRectMake(kZero, kZero, kScreenW, 200)]; [commentTextView becomeFirstResponder]; commentTextView.inputAccessoryView = keyboardTool; 實例二(修改鍵盤視圖,進行切換自定義視圖跟系統自帶視圖): /** * 切換鍵盤 */ - (void)switchKeyboard { // self.textView.inputView == nil : 使用的是系統自帶的鍵盤 if (self.textView.inputView == nil) { // 切換為自定義的表情鍵盤 emtionKeyboard為一個視圖 self.textView.inputView = self.emotionKeyboard; // 顯示鍵盤按鈕 self.toolbar.showKeyboardButton = YES; } else { // 切換為系統自帶的鍵盤 self.textView.inputView = nil; // 顯示表情按鈕 self.toolbar.showKeyboardButton = NO; } // 開始切換鍵盤 這個是為固定用的 self.switchingKeybaord = YES; // 退出鍵盤 [self.textView endEditing:YES]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ // 彈出鍵盤,讓其慢點實現 [self.textView becomeFirstResponder]; // 結束切換鍵盤 self.switchingKeybaord = NO; }); } /** * 鍵盤的frame發生改變時調用(顯示、隱藏等) */ - (void)keyboardWillChangeFrame:(NSNotification *)notification { // 如果正在切換鍵盤,就不要執行後面的代碼 if (self.switchingKeybaord) return; NSDictionary *userInfo = notification.userInfo; // 動畫的持續時間 double duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]; // 鍵盤的frame CGRect keyboardF = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue]; // 執行動畫 [UIView animateWithDuration:duration animations:^{ // 工具條的Y值 == 鍵盤的Y值 - 工具條的高度 if (keyboardF.origin.y > self.view.height) { // 鍵盤的Y值已經遠遠超過了控制器view的高度 self.toolbar.y = self.view.height - self.toolbar.height; } else { self.toolbar.y = keyboardF.origin.y - self.toolbar.height; } }]; } 4:修改UISearchBar中關於cannel取消的文字 -(UISearchBar *)mySearchBar { if (_mySearchBar==nil) { _mySearchBar=[[UISearchBar alloc]init]; _mySearchBar.showsCancelButton=YES; _mySearchBar.delegate=self; [_mySearchBar sizeToFit]; [_mySearchBar setPlaceholder:@"請輸入"]; [_mySearchBar setY:20]; //處理cannel的文字顯示 for (id item in [_mySearchBar subviews]) { for(id cc in [item subviews]) { if ([cc isKindOfClass:[UIButton class]]) { UIButton *btn=(UIButton *)cc; [btn setTitle:@"取消" forState:UIControlStateNormal]; } } } } return _mySearchBar; } 如果是獲得瞧點才顯示出取消可以在這個委托裡面進行設置: /** * @author wujunyang, 15-06-24 11:06:44 * * @brief 修改cancel的顯示文字 必先把showscancelButton設置為yes * @param searchBar <#searchBar description#> */ - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar { searchBar.showsCancelButton=YES; for (id item in [searchBar subviews]) { for(id cc in [item subviews]) { if ([cc isKindOfClass:[UIButton class]]) { UIButton *btn=(UIButton *)cc; [btn setTitle:@"取消" forState:UIControlStateNormal]; } } } } 5:關於navigationController中增加控件時push跳轉及跳回 在子頁navigationController增加控件,回跳時它是沒辦法自個銷除,所以要手動增加一個銷除nav所增加的控件,否則子頁的那個控件會被重疊顯示在父頁的nav上;如下一個實例: 在viewDidLoad裡 //加載控件 [self.navigationController.view addSubview:self.mySearchBar]; (void)viewWillDisappear:(BOOL)animated { //這句也可以寫在回跳前 [self.mySearchBar removeFromSuperview]; [super viewWillDisappear:animated]; } 6:整個視圖點擊都對鍵盤進行收縮 - (void)viewDidLoad { [super viewDidLoad]; UITapGestureRecognizer *tapGr=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped:)]; //如果沒有這句在view中的Button等可能無法觸發ToucheUpInside事件 tapGr.cancelsTouchesInView=NO; [self.view addGestureRecognizer:tapGr]; } - (IBAction)BtnAction:(id)sender { NSLog(@"%@",self.myTextField.text); } -(void)viewTapped:(UITapGestureRecognizer *)tapGr { [self.myTextField resignFirstResponder]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } @end 7:針對第三方插件為mrc,而工程為arc的調用 對第三方插件的.m文件進行設置,工程targets-build phases-compile sources 設置-fno-objc-arc 有些是雙星如 PLTexture **previewTextures; 在arc下面則要修改成:PLTexture * __unsafe_unretained *previewTextures; 8:通知的方式實現鍵盤的收縮布局問題 /** * 添加工具條 */ - (void)setupToolbar { // 1.添加工具條 IWComposeToolbar *toolbar = [[IWComposeToolbar alloc] init]; toolbar.delegate = self; CGFloat toolbarH = 35; CGFloat toolbarW = self.view.width; CGFloat toolbarY = self.view.height - toolbarH; toolbar.frame = CGRectMake(0, toolbarY, toolbarW, toolbarH); [self.view addSubview:toolbar]; self.toolbar = toolbar; // 2.監聽鍵盤的彈出和隱藏 // 鍵盤的frame(位置)即將改變, 就會發出UIKeyboardWillChangeFrameNotification // 鍵盤即將彈出, 就會發出UIKeyboardWillShowNotification [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; // 鍵盤即將隱藏, 就會發出UIKeyboardWillHideNotification [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil]; } #pragma mark - 鍵盤處理 /** * 鍵盤即將隱藏 */ - (void)keyboardWillHide:(NSNotification *)note { // 1.鍵盤彈出需要的時間 CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]; // 2.動畫 [UIView animateWithDuration:duration animations:^{ self.toolbar.transform = CGAffineTransformIdentity; }]; } /** * 鍵盤即將彈出 */ - (void)keyboardWillShow:(NSNotification *)note { // 1.鍵盤彈出需要的時間 CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]; // 2.動畫 [UIView animateWithDuration:duration animations:^{ // 取出鍵盤高度 CGRect keyboardF = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue]; CGFloat keyboardH = keyboardF.size.height; self.toolbar.transform = CGAffineTransformMakeTranslation(0, - keyboardH); }]; } //通知要銷掉 - (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; } 注意:[self.textView resignFirstResponder];放棄瞧點 還有可以監聽輸入內容的變化: // 2.監聽textView文字的改變 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextViewTextDidChangeNotification object:textView]; 9:封裝一個uivew帶有按鍵工具欄的實例 .h文件內容: #import <UIKit/UIKit.h> @class IWComposeToolbar; typedef enum { IWComposeToolbarButtonTypeCamera, IWComposeToolbarButtonTypePicture, IWComposeToolbarButtonTypeMention, IWComposeToolbarButtonTypeTrend, IWComposeToolbarButtonTypeEmotion } IWComposeToolbarButtonType; @protocol IWComposeToolbarDelegate <NSObject> @optional - (void)composeToolbar:(IWComposeToolbar *)toolbar didClickButton:(IWComposeToolbarButtonType)butonType; @end @interface IWComposeToolbar : UIView @property (weak, nonatomic) id<IWComposeToolbarDelegate> delegate; @end .m文件內容: #import "IWComposeToolbar.h" @implementation IWComposeToolbar - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { // 1.設置背景 self.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithName:@"compose_toolbar_background"]]; // 2.添加按鈕 [self addButtonWithIcon:@"compose_camerabutton_background" highIcon:@"compose_camerabutton_background_highlighted" tag:IWComposeToolbarButtonTypeCamera]; [self addButtonWithIcon:@"compose_toolbar_picture" highIcon:@"compose_toolbar_picture_highlighted" tag:IWComposeToolbarButtonTypePicture]; [self addButtonWithIcon:@"compose_mentionbutton_background" highIcon:@"compose_mentionbutton_background_highlighted" tag:IWComposeToolbarButtonTypeMention]; [self addButtonWithIcon:@"compose_trendbutton_background" highIcon:@"compose_trendbutton_background_highlighted" tag:IWComposeToolbarButtonTypeTrend]; [self addButtonWithIcon:@"compose_emoticonbutton_background" highIcon:@"compose_emoticonbutton_background_highlighted" tag:IWComposeToolbarButtonTypeEmotion]; } return self; } - (void)addButtonWithIcon:(NSString *)icon highIcon:(NSString *)highIcon tag:(IWComposeToolbarButtonType)tag { UIButton *button = [[UIButton alloc] init]; button.tag = tag; ; forState:UIControlStateNormal]; forState:UIControlStateHighlighted]; [self addSubview:button]; } /** * 監聽按鈕點擊 */ - (void)buttonClick:(UIButton *)button { if ([self.delegate respondsToSelector:@selector(composeToolbar:didClickButton:)]) { [self.delegate composeToolbar:self didClickButton:button.tag]; } } - (void)layoutSubviews { [super layoutSubviews]; int count = self.subviews.count; CGFloat buttonW = self.width / count; CGFloat buttonH = self.height; for (int i = 0; i<count; i++) { UIButton *button = self.subviews[i]; CGFloat buttonX = buttonW * i; button.frame = CGRectMake(buttonX, 0, buttonW, buttonH); } } @end