将CGGradient作为子图层添加到UILabel会隐藏标签文本 [英] Adding a CGGradient as sublayer to UILabel hides the text of label

问题描述

我想将渐变添加为标签的背景。我使用以下代码来实现这一点。但问题是虽然渐变颜色出现在标签上，但文字不可见。请帮助

I want to add the gradient as a background to label. I used the following code to acheive that. but the problem is that though the gradient color appears on the label, but the text is not visible. please help

lblPatientDetail.text=PatientsDetails;

lblPatientDetail.textColor=[UIColor blackColor];  

CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = lblPatientDetail.bounds;
gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor whiteColor] CGColor],(id)[[UIColor colorWithRed:255/255.0 green:239/255.0 blue:215/255.0 alpha:1.0] CGColor],nil];  

[lblPatientDetail.layer addSublayer:gradient];

lblPatientDetail.backgroundColor=[UIColor clearColor];

推荐答案

将子图层插入UILabel会隐藏文本，所以得到你想要的最好的方法是将标签和渐变层添加到UIView。

Inserting a sublayer to a UILabel hides the text, so the best way to get what you want is to add the label and gradient layer to a UIView.

UIView *gradientLabelView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 30)];

CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = gradientLabelView.bounds;
gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor whiteColor] CGColor],(id)[[UIColor colorWithRed:255/255.0 green:239/255.0 blue:215/255.0 alpha:1.0] CGColor],nil];

[gradientLabelView.layer addSublayer:gradient];

lblPatientDetail.frame = gradientLabelView.bounds;
lblPatientDetail.backgroundColor = [UIColor clearColor];
[gradientLabelView addSubview:lblPatientDetail];

[self addSubview:gradientLabelView];

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