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JXAttributeLabel

Label显示不同的字体颜色 详情看这篇:http://www.jianshu.com/p/1e955cbbe5a2

继承UILabel写个类,快速设置多种字体属性。

JXAttributeLabel.png

思路

把Label显示的内容中,属性相同的连续文字作为一个段(Section),这样只需要对外提供两个方法,即可实现。

  • 为指定的段设置属性
  • 为指定的段设置文字

类定义

JXAttributeLabel.h

@interface JXAttributeLabel : UILabel

/// 设置属性,section为段号
- (void)setAttributes:(NSDictionary *)attributes atSection:(NSInteger)section;

/// 设置字符串,section为段号
- (void)setString:(NSString *)string atSection:(NSInteger)section;

@end

调用方法

我做了个Demo,在一个Label上展示四段属性随机的文字。

JXAttributeLabel.gif

- (IBAction)touchSection0:(UIButton *)sender {
    [self setRandomContentWithSectionIndex:0];
}

- (IBAction)touchSection1:(UIButton *)sender {
    [self setRandomContentWithSectionIndex:1];
}

- (IBAction)touchSection2:(UIButton *)sender {
    [self setRandomContentWithSectionIndex:2];
}

- (IBAction)touchSection3:(UIButton *)sender {
    [self setRandomContentWithSectionIndex:3];
}

- (void)setRandomContentWithSectionIndex:(NSInteger)sectionIndex {
    NSDictionary *attr = [self randomAttribute];
    NSString *str = [self randomString];
    [self.label setAttributes:attr atSection:sectionIndex];
    [self.label setString:str atSection:sectionIndex];
}

- (NSDictionary *)randomAttribute {
    NSInteger fontSize = arc4random_uniform(6) + 12;
    UIFont *font = [UIFont systemFontOfSize:fontSize];
    UIColor *color = [UIColor colorWithRed:arc4random_uniform(255) / 255.0 green:arc4random_uniform(255) / 255.0 blue:arc4random_uniform(255) / 255.0 alpha:1.0];
    return @{NSFontAttributeName : font,
             NSForegroundColorAttributeName : color};
}

- (NSString *)randomString {
    NSInteger index = arc4random_uniform(4);
    return self.stringArray[index];
}

可以看到,使用方法就是两行:

[self.label setAttributes:attr atSection:sectionIndex];
[self.label setString:str atSection:sectionIndex];

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Label显示不同的字体颜色

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