iOS 简单提示view

+(void)showMessage:(NSString *)message
{
    UIWindow * window = [UIApplication sharedApplication].keyWindow;
    UIView *showview =  [[UIView alloc]init];
    showview.backgroundColor = [UIColor blackColor];
    showview.frame = CGRectMake(1, 1, 1, 1);
    showview.alpha = 1.0f;
    showview.layer.cornerRadius = 5.0f;
    showview.layer.masksToBounds = YES;
    [window addSubview:showview];
    
    UILabel *label = [[UILabel alloc]init];
    CGSize LabelSize = [message sizeWithFont:[UIFont systemFontOfSize:17] constrainedToSize:CGSizeMake(290, 9000)];
    label.frame = CGRectMake(10, 5, LabelSize.width, LabelSize.height);
    label.text = message;
    label.textColor = [UIColor whiteColor];
    label.textAlignment = NSTextAlignmentCenter;
    label.backgroundColor = [UIColor clearColor];
    label.font = [UIFont boldSystemFontOfSize:13];
    [showview addSubview:label];
    showview.frame = CGRectMake((ScreenWidth – LabelSize.width – 20)/2,  200, LabelSize.width+20, LabelSize.height+10);
    [UIView animateWithDuration:2.5 animations:^{
        showview.alpha = 0;
    } completion:^(BOOL finished) {
        [showview removeFromSuperview];
    }];
}

#define ScreenWidth [[UIScreen mainScreen] bounds].size.width//获取屏幕宽度