创建提示语

#pragma mark 创建提示语的方法

- (void)createTiShiLabel:(NSString *)text

{

    NSDictionary *attrs = @{NSFontAttributeName : [UIFont systemFontOfSize:14]};

    CGRect textRect = [text boundingRectWithSize:CGSizeMake(ScreenWidth-100, MAXFLOAT)

                                         options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading

                                      attributes:attrs

                                         context:nil];

    

    UILabel *hintLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, textRect.size.width, 30)];

    hintLabel.center = CGPointMake(ScreenWidth / 2, ScreenHeight * 0.5);

    hintLabel.text = text;

    hintLabel.textColor = [UIColor whiteColor];

    hintLabel.font = [UIFont systemFontOfSize:13];

    hintLabel.textAlignment = NSTextAlignmentCenter;

    hintLabel.numberOfLines = 0;

    hintLabel.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];

    hintLabel.layer.masksToBounds = YES;

    hintLabel.layer.cornerRadius = 6;

    [UIView animateWithDuration:0.1 animations:^{

        [UIView animateWithDuration:0.1 delay:1.0 options:UIViewAnimationOptionCurveLinear animations:^{

            hintLabel.alpha = 1;

        } completion:^(BOOL finished) {

            [UIView animateWithDuration:0.35 delay:0.5 options:UIViewAnimationOptionCurveLinear animations:^{

                hintLabel.alpha = 0;

            } completion:^(BOOL finished) {

                [hintLabel removeFromSuperview];

            }];

        }];

    }];

    hintLabel.textAlignment = NSTextAlignmentCenter;

    [self.view addSubview:hintLabel];

}