iOS / Objecitve-C UILabel文字字距 [英] iOS/Objecitve-C UILabel text kerning

问题描述

我正在寻找如何增加 UILabel 中的字符间距，以使我的UI设计实现更具吸引力。我找到了以下

但是它似乎并没有在UI上生效当应用程序正在运行，并在界面生成器的文本消失。

请有人帮助我，并指出我做错了什么。

感谢高级！

解决方案

您想更新每次更正字距时，所以，你的.h应该看起来像：

  IB_DESIGNABLE 
 @interface KerningLabel：UILabel 
 
 @property（非原子）IBInspectable CGFloat字距调整; 
 
 @end 
  

和您的.m：

  @implementation KerningLabel 
 
  - （void）setKerning：（CGFloat）kerning 
 {
 _kerning =字距; 
 
 if（self.attributedText）
 {
 NSMutableAttributedString * attribString = [[NSMutableAttributedString alloc] initWithAttributedString：self.attributedText]; 
 [attribString addAttribute：NSKernAttributeName value：@（kerning）range：NSMakeRange（0，self.attributedText.length）]; 
 self.attributedText = attribString; 
} 
} 
 
 @end 
  

I was in search of how to increase character spacing in UILabels to make more attractive my UI Design implementations for the Apps I do. And I found following answer, which tells it allows to adjust the Text Kerning, and it's written in Swift.

But what I needed is an Objective-C Solution. So I tried to convert the following code snippet:

import UIKit
@IBDesignable
class KerningLabel: UILabel {
    @IBInspectable var kerning:CGFloat = 0.0{
        didSet{
            if ((self.attributedText?.length) != nil)
            {
                let attribString = NSMutableAttributedString(attributedString: self.attributedText!)
                attribString.addAttributes([NSKernAttributeName:kerning], range:NSMakeRange(0, self.attributedText!.length))
                self.attributedText = attribString
            }
        }
    }
}

to following in Objective-C:
KerningLabel.h:

#import <UIKit/UIKit.h>
IB_DESIGNABLE
@interface KerningLabel : UILabel
@property (nonatomic) IBInspectable CGFloat kerning;
@end

KerningLabel.m:

#import "KerningLabel.h"

@implementation KerningLabel
@synthesize kerning;
- (void) setAttributedText:(NSAttributedString *)attributedText {
    if ([self.attributedText length] > 0) {
        NSMutableAttributedString *muAttrString = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
        [muAttrString addAttribute:NSKernAttributeName value:@(self.kerning) range:NSMakeRange(0, [self.attributedText length])];
        self.attributedText = muAttrString;
    }
}
@end

And it gives the following Attribute in XCode IB to adjust the Kerning,

But it really doesn't seems to be taking effect on the UI when the App is running and also in the Interface Builder the text goes disappearing.

Please somebody help me and point out what I have done wrong.

Thanks in Advanced!

解决方案

You want to update your attributedText every time kerning is updated. So, your .h should look like:

IB_DESIGNABLE
@interface KerningLabel : UILabel

@property (nonatomic) IBInspectable CGFloat kerning;

@end

and your .m :

@implementation KerningLabel

- (void)setKerning:(CGFloat)kerning
{
    _kerning = kerning;

    if(self.attributedText)
    {
        NSMutableAttributedString *attribString = [[NSMutableAttributedString alloc]initWithAttributedString:self.attributedText];
        [attribString addAttribute:NSKernAttributeName value:@(kerning) range:NSMakeRange(0, self.attributedText.length)];
        self.attributedText = attribString;
     }
}

@end

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