使用NSMutableAttributedString更改NSString的颜色和大小部分

时间:2014-03-12 18:18:17

标签: ios objective-c nsattributedstring

浏览了几个NSAttributedString示例,但似乎无法使其正常工作。我正在尝试更改NSMutableAttributedString部分的大小颜色

我尝试了一些变体:

NSMutableAttributedString *hintText = [[NSMutableAttributedString alloc] initWithString:@"This is red and huge and this is not"];

//Black and large
[hintText setAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Futura-Medium" size:20.0f], NSForegroundColorAttributeName:[UIColor blackColor]} range:NSMakeRange(0, 11)];

//Rest of text -- just futura
[hintText setAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Futura-Medium" size:16.0f]} range:NSMakeRange(12, ((hintText.length -1) - 12))];

这只会改变文本的大小,而不是颜色。有人能指出我正确的方向吗?

编辑:我这样使用它:myUILabel.attributedText = hintText;

1 个答案:

答案 0 :(得分:3)

当我尝试做这样的事情时,我发现构建单个部件(每个部件都是NSAttributedString)更容易,然后将它们“粘合”在一起,如下所示:< / p>

NSAttributedString *string1 = // Get the red and large string here
NSAttributedString *string2 = // Get the just futura string here

NSMutableAttributedString *hintText = [[NSMutableAttributedString alloc] init];
[hintText appendAttributedString:string1];
[hintText appendAttributedString:string2];

我发现这样可以更容易地遵循逻辑流程,而且我从未发现这种方式存在需要优化的性能限制。

<小时/> 的 更新

FWIW,我得到以下代码,因为我相信OP的愿望:

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSMutableAttributedString *hintText = [[NSMutableAttributedString alloc] initWithString:@"This is red and huge and this is not"];

    //Red and large
    [hintText setAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Futura-Medium" size:20.0f], NSForegroundColorAttributeName:[UIColor redColor]} range:NSMakeRange(0, 20)];

    //Rest of text -- just futura
    [hintText setAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Futura-Medium" size:16.0f]} range:NSMakeRange(20, hintText.length - 20)];

    [self.button setAttributedTitle:hintText forState:UIControlStateNormal];

}

请注意,他正在指定[UIColor blackColor],我将其更新为[UIColor redColor]。此外,我更新了范围计算,以包括“这是红色和巨大”中的所有字符。