如何在图像中实现背景图像在UILabel中？

Question

如何实现以下效果？

我希望当我的UIImage宽度小于UILabel宽度时，我的图像应该只显示一次，如下所示。

我已经用UILabel和UIImage做了一些更多的工作。参考我以前的问题：How to stretch Image to fill the Label Width set in Background in UILabel?。

但现在我希望有更多的乐趣与UILabel ...：d

编辑：

SBLabel *lbl = [[SBLabel alloc] initWithFrame:CGRectMake(0, 50, 320, 28)]; 
lbl.text = @"Hello World!!!..."; 
UIImage *img = [UIImage imageNamed:@"cn3.png"]; 
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 50, 320, 28)]; 
imgView.image = img; 
[lbl setNonRepeatingBackgroundImage:imgView]; 
[self.view addSubview:lbl]; 

[imgView release]; 

Answer 1

if (image.size.width < label.size.width ||image.size.height < label.size.height) 
{ 
//rect here is frame of image 
    [img drawInRect:rect]; 
    label.backgroudColor = [UIColor clearColor]; 
} 

Answer 2

这似乎是最直接的解决办法是让您的UIImage坐在您的UILabel后面，并且您的UILabel具有透明背景色。

编辑

假设你正在使用ARC ...

SBLabel.h

#import <UIKit/UIKit.h> 

@interface SBLabel : UILabel 

@property (nonatomic, strong) UIImageView *nonRepeatingBackgroundImage; 

@end 

SBLabel.m

#import "SBLabel.h" 

@implementation SBLabel 

@synthesize nonRepeatingBackgroundImage; 

- (void)setNonRepeatingBackgroundImage:(UIImageView *)aNonRepeatingBackgroundImage { 
    nonRepeatingBackgroundImage = aNonRepeatingBackgroundImage; 
    [self addSubview:aNonRepeatingBackgroundImage]; 
    [self sendSubviewToBack:aNonRepeatingBackgroundImage]; 
    [self setBackgroundColor:[UIColor clearColor]]; 
} 

@end 

将UILabel添加到父视图后，您需要调用此setter方法。我没有测试，但我相信它应该可以工作，可能需要一些调整，但希望它解释了如何子类UILabel作出这样的自定义增强。

Answer 3

的UILabel的一个子类可能看起来像这样（没有ARC）

CustomLabel.h

#import <UIKit/UIKit.h> 

@interface CustomLabel : UILabel { 
    UIImage *mImage; 
} 
@property (retain) UIImage *image; 
@end 

CustomLabel.m

#import "CustomLabel.h" 

@implementation CustomLabel 

- (void)dealloc { 
    self.image = nil; 
    [super dealloc]; 
} 

- (void)drawRect:(CGRect)rect { 
    [mImage drawAtPoint:CGPointMake(0, 0)]; 
    [super drawRect:rect]; 
} 

- (UIImage*)image { 
    return mImage; 
} 

- (void)setImage:(UIImage *)image { 
    self.backgroundColor = [UIColor clearColor]; 

    if(mImage) 
     [mImage release]; 
    mImage = [image retain]; 
    [self setNeedsDisplay]; 
} 
@end 

使用

yourCustomLabel.image = [UIImage imageNamed:@"test.png"];