在iOS中实现类似安卓自动消失提示框

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转载搬运。

1. +(void)showMessage:(NSString *)message
   
2. {
   
3.     UIWindow * window = [UIApplication sharedApplication].keyWindow;
   
4.     UIView *showview =  [[UIView alloc]init];
   
5.     showview.backgroundColor = [UIColor blackColor];
   
6.     showview.frame = CGRectMake(1, 1, 1, 1);
   
7.     showview.alpha = 1.0f;
   
8.     showview.layer.cornerRadius = 5.0f;
   
9.     showview.layer.masksToBounds = YES;
   
10.     [window addSubview:showview];
    
11.      
    
12.     UILabel *label = [[UILabel alloc]init];
    
13.     CGSize LabelSize = [message sizeWithFont:[UIFont systemFontOfSize:17] constrainedToSize:CGSizeMake(290, 9000)];
    
14.     label.frame = CGRectMake(10, 5, LabelSize.width, LabelSize.height);
    
15.     label.text = message;
    
16.     label.textColor = [UIColor whiteColor];
    
17.     label.textAlignment = 1;
    
18.     label.backgroundColor = [UIColor clearColor];
    
19.     label.font = [UIFont boldSystemFontOfSize:15];
    
20.     [showview addSubview:label];
    
21.     showview.frame = CGRectMake((SCREEN_WIDTH - LabelSize.width - 20)/2, SCREEN_HEIGHT - 100, LabelSize.width+20, LabelSize.height+10);
    
22.     [UIView animateWithDuration:1.5 animations:^{
    
23.         showview.alpha = 0;
    
24.     } completion:^(BOOL finished) {
    
25.         [showview removeFromSuperview];
    
26.     }];
    
27. }

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