iOS 渐变提示。Labe自动换行

UILabel *noticeLabel = [[UILabel alloc]init];

noticeLabel.text = @"当前账号已失效果，已清除当前账号已失效果，已清除当前账号已失效果，已清除当前账号已失效果，已清除当前账号已失效果，已清除当前账号已失效果，已清除";

noticeLabel.frame = CGRectMake(0, 400, 300, 60);

noticeLabel.textColor = [UIColor whiteColor];

[self.view addSubview:noticeLabel];

noticeLabel.backgroundColor = [UIColor grayColor];

noticeLabel.numberOfLines = 0;//表示label可以多行显示

noticeLabel.lineBreakMode = NSLineBreakByClipping;

CGSize size = [noticeLabel sizeThatFits:CGSizeMake(noticeLabel.frame.size.width, MAXFLOAT)];

noticeLabel.frame =CGRectMake(10, 400, 300, size.height);

[UIView beginAnimations:nil context:nil];

[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];

[UIView setAnimationDuration:4.0];

[UIView setAnimationDelegate:self];

noticeLabel.alpha = 0.0;

[UIView commitAnimations];