如何在iPhone UILabel中设置字间距 [英] How to set kerning in iPhone UILabel

问题描述

我正在开发一个iPhone应用程序，我想在UILabel中设置kerning。我写的代码（可能在 kCTKernAttributeName ）似乎是错误的。我可以如何解决这个问题？

I am developing an iPhone app, and I want to set kerning in UILabel. The code I've written (possibly around kCTKernAttributeName) seems to be in error. How might I approach fixing this?

NSMutableAttributedString *attStr;   
NSString *str = @"aaaaaaa";    
CFStringRef kern = kCTKernAttributeName;        
NSNumber *num = [NSNumber numberWithFloat: 2.0f];    
NSDictionary *attributesDict = [NSDictionary dictionaryWithObject:num 
forKey:(NSString*)kern];        
[attStr initWithString:str attributes:attributesDict];      
CGRect frame1 = CGRectMake(0, 0, 100, 40);    
UILabel *label1 = [[UILabel alloc] initWithFrame:frame1];    
label1.text = attStr    
[self.view addSubview:label1];

推荐答案

老问题，但你现在可以）。

Old question, but you can do it now (easily).

NSMutableAttributedString *attributedString;
attributedString = [[NSMutableAttributedString alloc] initWithString:@"Please get wider"];
[attributedString addAttribute:NSKernAttributeName value:@5 range:NSMakeRange(10, 5)];
[self.label setAttributedText:attributedString];

对于2013年11月，只是为了扩展这个伟大的答案，这里有一些完全典型的代码。通常你也要设置字体。注释在注释中的老式方式使用普通的旧的.text。希望它帮助某人

For Nov 2013, Just to expand on this great answer, here's some totally typical code. Usually you'd set the font as well. Note in the comments the old-fashioned way using ordinary old .text. Hope it helps someone

NSString *yourText = @"whatever";

UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,0,0)];

// simple approach with no tracking...
// label.text = yourText;
// [label setFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:24]];

NSMutableAttributedString *attributedString;

attributedString = [[NSMutableAttributedString alloc] initWithString:yourText];

[attributedString addAttribute:NSKernAttributeName
                         value:[NSNumber numberWithFloat:2.0]
                         range:NSMakeRange(0, [yourText length])];

[attributedString addAttribute:NSFontAttributeName
                         value:[UIFont fontWithName:@"HelveticaNeue-Light" size:24]
                         range:NSMakeRange(0, [yourText length])];

label.attributedText = attributedString;

label.textColor = [UIColor blackColor];
label.backgroundColor = [UIColor clearColor];
label.textAlignment = NSTextAlignmentCenter;

[label sizeToFit];

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