模拟android toast

-(void)showMessage:(NSString *)message

{

    UIWindow * window = [UIApplicationsharedApplication].keyWindow;

    UIView *showview = [[UIViewalloc]init];

    showview.backgroundColor = [UIColorblackColor];

    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 = [[UILabelalloc]init];

    CGSize LabelSize = [messagesizeWithFont:[UIFontsystemFontOfSize:17]constrainedToSize:CGSizeMake(290,9000)];

    label.frame =CGRectMake(10,5, LabelSize.width, LabelSize.height);

    label.text = message;

    label.textColor = [UIColorwhiteColor];

    label.textAlignment =1;

    label.backgroundColor = [UIColorclearColor];

    label.font = [UIFontboldSystemFontOfSize:15];

    [showview addSubview:label];

    showview.frame =CGRectMake(([UIScreenmainScreen].bounds.size.width- LabelSize.width - 20)/2, [UIScreenmainScreen].bounds.size.height-100, LabelSize.width+20, LabelSize.height+10);

    [UIViewanimateWithDuration:2.0animations:^{

        showview.alpha =0;

    } completion:^(BOOL finished) {

        [showview removeFromSuperview];

    }];

}