在開發中,現在很多app更新了新功能時都會給出用戶一個提示,以方便用戶更好的體驗,那麼這個功能如何實現的呢?
首先看下效果圖:
1.首先創建第一個viewcontroller 在上面放上一個imageview和一個按鈕
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. UIImageView *imageview=[[UIImageView alloc]init]; imageview.frame=CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height); imageview.image=[UIImage imageNamed:@"girl.png"]; [self.view addSubview:imageview]; UIButton *Btn=[[UIButton alloc]init]; Btn.frame=CGRectMake(20, 100, 50, 50); Btn.backgroundColor=[UIColor blueColor]; [Btn addTarget:self action:@selector(btnclick) forControlEvents:UIControlEventTouchUpInside]; [imageview addSubview:Btn]; imageview.userInteractionEnabled=YES; } -(void)btnclick { BackViewController *backVc=[[BackViewController alloc]init]; [self presentViewController:backVc animated:YES completion:nil]; }
2.這時候我們在創建一個BackViewController 設置透明即可
- (instancetype)init { self = [super init]; if (self) { self.view.backgroundColor=[UIColor colorWithWhite:0 alpha:0.4]; self.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; self.modalPresentationStyle = UIModalPresentationOverFullScreen; } return self; }
這裡提示一點,很多時候我們對視圖直接設置alpha屬性的值會導致其子控件也變得半透明,而通常我們的需求是:背景半透明而其子控件不透明。
因此我們可以用一下方法設置透明度
//只設置黑白背景色 white後面的參數表示灰度,從0-1之間表示從黑到白的變化,alpha就是你想調整的透明度。 blackV.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.7]; //設置任意顏色的背景色 blackV.backgroundColor = [UIColor colorWithRed:122/255.0 green:123/255.0 blue:234/255.0 alpha:0.7]; UIColor *color = [UIColor blackColor]; bgView.backgroundColor = [color colorWithAlphaComponent:0.5];
3.設置BackViewController上面的控件
- (void)viewDidLoad { [super viewDidLoad]; UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom]; btn.frame=CGRectMake(50, 300, 50, 50); // btn.backgroundColor=[UIColor blueColor]; [self.view addSubview:btn]; [btn setBackgroundImage:[UIImage imageNamed:@"userGuideBtnBG_unClear.png"] forState:UIControlStateNormal]; [btn addTarget:self action:@selector(btnclick) forControlEvents:UIControlEventTouchUpInside]; btn.backgroundColor=[UIColor clearColor]; btn.alpha=0.75; UIView *view1=[[UIView alloc]init]; view1.backgroundColor=[UIColor blackColor]; view1.alpha=0.75; [self.view addSubview:view1]; view1.frame=CGRectMake(0, 0, self.view.frame.size.width, 300); UIView *view2=[[UIView alloc]init]; view2.backgroundColor=[UIColor blackColor]; view2.alpha=0.75; [self.view addSubview:view2]; view2.frame=CGRectMake(0, 300+50, self.view.frame.size.width, self.view.frame.size.height-50-300); UIView *view3=[[UIView alloc]init]; view3.backgroundColor=[UIColor blackColor]; view3.alpha=0.75; [self.view addSubview:view3]; view3.frame=CGRectMake(0, 300, 50, 50); UIView *view4=[[UIView alloc]init]; view4.backgroundColor=[UIColor blackColor]; view4.alpha=0.75; [self.view addSubview:view4]; view4.frame=CGRectMake(50+50, 300, self.view.frame.size.width-50-50, 50); UILabel *titlelabel=[[UILabel alloc]init]; titlelabel.frame=CGRectMake(100, 350,100,50 ); [self.view addSubview:titlelabel]; titlelabel.text=@"這是新功能"; titlelabel.textColor=[UIColor whiteColor]; } -(void)btnclick { [self dismissViewControllerAnimated:YES completion:nil]; }
原理很簡單,我們present出來一個透明的控制器,這樣在控制器上面放上幾個深度alpha的view和一個btn,哦,還需要一個label提示文字,也可以自己再添加一些箭頭什麼的,當然這個btn時美工扣圖處理之後給你的,然後通過改變它們的frame來實現不同位置的提示。因為是做的demo所以我用了frame,我建議用autolayout去定它們之間的關系,然後用transform來實現移動frame,然後可以提示多個新功能。
btn摳圖之後的效果:
以上所述是小編給大家介紹的iOS新功能引導提示界面實例詳解,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復大家的。在此也非常感謝大家對本站網站的支持!