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我已将子类UILabel类重写为drawRect:
方法。 IB中的标签与创建的子类相关联。它出现在屏幕上,但它不显示任何文本,不管它是在IB中还是以编程方式设置。标签本身出现在屏幕上,当我记录它的text
属性时,它显示OK。UILabel子类不显示文本
这里是我的代码:
MyLabel.h
#import <UIKit/UIKit.h>
@interface MyLabel : UILabel
@end
MyLabel.m
#import "MyLabel.h"
#import <QuartzCore/QuartzCore.h>
@implementation MyLabel
- (void)drawRect:(CGRect)rect {
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = UIGraphicsGetCurrentContext();
UIColor *borderColor = [UIColor colorWithWhite: .1f alpha: 5.f];
UIColor *topColor = [UIColor colorWithWhite: .3f alpha: 5.f];
UIColor *bottomColor = [UIColor colorWithWhite: .5f alpha: 5.f];
UIColor *innerGlow = [UIColor colorWithWhite: 1.f alpha: .25f];
NSArray *gradientColors = @[(id)topColor.CGColor, (id)bottomColor.CGColor];
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) gradientColors, NULL);
CGFloat bWidth = self.frame.size.width;
CGFloat bHeight = self.frame.size.height;
UIBezierPath *roundedRectanglePath = [UIBezierPath bezierPathWithRoundedRect: CGRectMake(0, 0, bWidth, bHeight)
cornerRadius: 0];
[roundedRectanglePath addClip];
CGGradientRef background = gradient;
CGContextDrawLinearGradient(context, background, CGPointMake(bWidth/2.f, 0), CGPointMake(bWidth/2.f, bHeight), 0);
[borderColor setStroke];
roundedRectanglePath.lineWidth = 6;
[roundedRectanglePath stroke];
CGFloat glowRadius = 3.f;
UIBezierPath *innerGlowRect = [UIBezierPath bezierPathWithRoundedRect: CGRectMake(glowRadius, glowRadius, bWidth - 2 * glowRadius, bHeight - 2 * glowRadius) cornerRadius: 0];
[innerGlow setStroke];
innerGlowRect.lineWidth = 3;
[innerGlowRect stroke];
CGGradientRelease(gradient);
CGColorSpaceRelease(colorSpace);
}
@end
也许我需要重写drawTextInRect:
方法,但我不知道怎么办。 感谢您的帮助!
是的,这个工程太棒了!谢谢!我知道你不应该调用超类方法,如果你继承UIView,但错过了超类UILabel –
@NikitaShytyk为什么你不会在UIView子类上调用超类,而你的类超类可能是UILabel,但是UILabel的超类是UIView。 –
我正在尝试使用IBDesignable作为uilabel子类,并且像这样重写drawRect,但即使已经放置了[super drawRect:rect];也没有文本出现。哪里不对? – GeneCode