我的目标是通过执行以下操作为我的 uilabel 添加渐变(CustomLabelBackGround是UILabel 的子类)
@implementation CustomLabelBackGround
- (id)initWithFrame:(CGRect)frame {
if ((self = [super initWithFrame:frame])) {
// Initialization code
}
return self;
}
- (void)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGColorRef whiteColor = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0].CGColor;
CGColorRef lightGrayColor = [UIColor colorWithRed:230.0/255.0 green:230.0/255.0 blue:230.0/255.0 alpha:1.0].CGColor;
CGColorRef separatorColor = [UIColor colorWithRed:208.0/255.0 green:208.0/255.0 blue:208.0/255.0 alpha:1.0].CGColor;
CGRect paperRect = self.bounds;
// Fill with gradient
drawLinearGradient(context, paperRect, whiteColor, lightGrayColor);
// Add white 1 px stroke
CGRect strokeRect = paperRect;
strokeRect.size.height -= 1;
strokeRect = rectFor1PxStroke(strokeRect);
CGContextSetStrokeColorWithColor(context, whiteColor);
CGContextSetLineWidth(context, 1.0);
CGContextStrokeRect(context, strokeRect);
// Add separator
CGPoint startPoint = CGPointMake(paperRect.origin.x, paperRect.origin.y + paperRect.size.height - 1);
CGPoint endPoint = CGPointMake(paperRect.origin.x + paperRect.size.width - 1, paperRect.origin.y + paperRect.size.height - 1);
draw1PxStroke(context, startPoint, endPoint, separatorColor);
}
但是,当我尝试在屏幕上显示时,CustomLabelBackGround 的文本正在消失。请看下面的图片作为参考:
我在这里缺少什么。如果您对此有任何想法,请提供帮助。谢谢