这在Interface Builder中很容易做到:

1)在属性检查器中设置UILabel为Attributes

2)选择你想加粗的部分短语

3)在字体选择器中更改其字体(或相同字体的粗体)

这是所有!

试试UILabel上的分类:

下面是它的用法:

myLabel.text = @"Updated: 2012/10/14 21:59 PM";
[myLabel boldSubstring: @"Updated:"];
[myLabel boldSubstring: @"21:59 PM"];

这是分类

UILabel h +及。

- (void) boldSubstring: (NSString*) substring;
- (void) boldRange: (NSRange) range;

UILabel + Boldify.m

- (void) boldRange: (NSRange) range {
    if (![self respondsToSelector:@selector(setAttributedText:)]) {
        return;
    }
    NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
    [attributedText setAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:self.font.pointSize]} range:range];

    self.attributedText = attributedText;    
}

- (void) boldSubstring: (NSString*) substring {
    NSRange range = [self.text rangeOfString:substring];
    [self boldRange:range];
}

注意，这只适用于iOS 6及更高版本。在iOS 5或更早的版本中，它将被忽略。

在这种情况下，你可以尝试，

UILabel *displayLabel = [[UILabel alloc] initWithFrame:/*label frame*/];
displayLabel.font = [UIFont boldSystemFontOfSize:/*bold font size*/];

NSMutableAttributedString *notifyingStr = [[NSMutableAttributedString alloc] initWithString:@"Updated: 2012/10/14 21:59 PM"];
[notifyingStr beginEditing];
[notifyingStr addAttribute:NSFontAttributeName
                     value:[UIFont systemFontOfSize:/*normal font size*/]
                     range:NSMakeRange(8,10)/*range of normal string, e.g. 2012/10/14*/];
[notifyingStr endEditing];

displayLabel.attributedText = notifyingStr; // or [displayLabel setAttributedText: notifyingStr];

AttributeString构造函数,把马克字符串,这样做可能意味着你的属性字符串没有其他属性,因此,如果您使用的是xib,你可以没有大胆的文本,将所有你想要的其他属性,然后通过属性在代码中列举范围你记下的字符串,并将它们应用于带属性字符串从你xib文件,然后重新申请你认为AttributeString特定领域。

斯威夫特4:

// attribute with color red and Bold
var attrs1 = [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 20), NSAttributedStringKey.foregroundColor: UIColor.red]

// attribute with color black and Non Bold
var attrs2 = [NSAttributedStringKey.font: UIFont(name: "Roboto-Regular", size: 20), NSAttributedStringKey.foregroundColor: UIColor.black]  

var color1 = NSAttributedString(string: "RED", attributes: attrs1)

var color2 = NSAttributedString(string: " BLACK", attributes: attrs2)

var string = NSMutableAttributedString()

string.append(color1)

string.append(color2)

// print the text with **RED** BLACK
print("Final String : \(string)")

提供要处理的字符串作为输入，并提供粗体/彩色的单词作为输入。

func attributedString(parentString:String, arrayOfStringToProcess:[String], color:UIColor) -> NSAttributedString
{
    let parentAttributedString = NSMutableAttributedString(string:parentString, attributes:nil)
    let parentStringWords = parentAttributedString.string.components(separatedBy: " ")
    if parentStringWords.count != 0
    {
        let wordSearchArray = arrayOfStringToProcess.filter { inputArrayIndex in
            parentStringWords.contains(where: { $0 == inputArrayIndex }
            )}
        for eachWord in wordSearchArray
        {
            parentString.enumerateSubstrings(in: parentString.startIndex..<parentString.endIndex, options: .byWords)
            {
                (substring, substringRange, _, _) in
                if substring == eachWord
                {
                    parentAttributedString.addAttribute(.font, value: UIFont.boldSystemFont(ofSize: 15), range: NSRange(substringRange, in: parentString))
                    parentAttributedString.addAttribute(.foregroundColor, value: color, range: NSRange(substringRange, in: parentString))
                }
            }
        }
    }
    return parentAttributedString
}