在iOS7/iOS8中设计UILabel的文本最简单的方法。-EasiestwaytostylethetextofanUILabeliniOS7/iOS8

6  

You can use NSAttributedString's data:options:documentAttributes:error: initializer (first available in iOS 7.0 SDK).

您可以使用NSAttributedString的data:options:documentAttributes:error: initializer(在iOS 7.0 SDK中首先可用)。

import UIKit

let htmlString = "Objective: Construct an equilateral triangle from the line segment AB."
let htmlData = htmlString.dataUsingEncoding(NSUTF8StringEncoding)

let optiOns= [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType]
var error : NSError? = nil

let attributedString = NSAttributedString(data: htmlData, options: options, documentAttributes: nil, error: &error)

if error == nil {
    // we're good
}

Note: You might also want to include NSDefaultAttributesDocumentAttribute option in the options dictionary to provide additional global styling (such as telling not to use Times New Roman).

注意:您可能还希望在options字典中包含NSDefaultAttributesDocumentAttribute选项，以提供附加的全局样式(例如告诉不使用Times New Roman)。

Take a look into NSAttributedString UIKit Additions Reference for more information.

查看NSAttributedString UIKit添加引用以获得更多信息。

1  

I faced similar frustrations while trying to use attributed text in Xcode, so I feel your pain. You can definitely use multiple NSMutableAttributedtext's to get the job done, but this is very rigid.

我在尝试在Xcode中使用带属性的文本时遇到了类似的挫折，所以我感到您的痛苦。你可以使用多个NSMutableAttributedtext来完成这项工作，但这是非常严格的。

UIFont *normalFOnt= [UIFont fontWithName:@"..." size:20];
UIFont *boldFOnt= [UIFont fontWithName:@"..." size:20];
UIFont *italicizedFOnt= [UIFont fontWithName:@"..." size:20];
NSMutableAttributedString *total = [[NSMutableAttributedString alloc]init];

NSAttributedString *string1 = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"Objective"] attributes:@{NSFontAttributeName:boldFont}];

NSAttributedString *string2 = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@": Construct an "] attributes:@{NSFontAttributeName:normalFont}];

NSAttributedString *string3 = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"equilateral "] attributes:@{NSFontAttributeName:italicizedFont}];

NSAttributedString *string4 = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"triangle from the line segment AB."] attributes:@{NSFontAttributeName:normalFont}];

[total appendAttributedString:string1];
[total appendAttributedString:string2];
[total appendAttributedString:string3];
[total appendAttributedString:string4];

[self.someLabel setAttributedText: total];

Another option is to use NSRegularExpression. While this will require more lines of code, it is a more fluid way of bolding, changing color, etc from an entire string at once. For your purposes however, using the appendAttributedString will be the shortest way with a label.

另一种选择是使用NSRegularExpression。虽然这将需要更多的代码行，但这是一种更灵活的方法，可以同时从整个字符串中进行粗体、更改颜色等操作。但是，出于您的目的，使用appendAttributedString是使用标签的最短路径。

    UIFont *normalFOnt= [UIFont fontWithName:@"..." size:20];
    UIFont *boldFOnt= [UIFont fontWithFamilyName:@"..." size: 20];
    UIFont *italicizedFOnt= [UIFont fontWithFamilyName:@"..." size: 20];

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat: @"Objective: Construct an equilateral triangle from the line segment AB."] attributes:@{NSFontAttributeName:normalFont}];

    NSError *regexError;

    NSRegularExpression *regex1 = [NSRegularExpression regularExpressionWithPattern:@"Objective"
                                                                              options:NSRegularExpressionCaseInsensitive error:®exError];
    NSRegularExpression *regex2 = [NSRegularExpression regularExpressionWithPattern:@"equilateral"
                                                                             options:NSRegularExpressionCaseInsensitive error:®exError];
    if (!regexError)
    {
        NSArray *matches1 = [regex1 matchesInString:[attributedString string]
                                                options:0
                                                  range:NSMakeRange(0, [[attributedString string] length])];
        NSArray *matches2 = [regex2 matchesInString:[attributedString string]
                                                options:0
                                                  range:NSMakeRange(0, [[attributedString string] length])];

        for (NSTextCheckingResult *aMatch in matches1)
        {
            NSRange matchRange = [aMatch range];
            [attributedString setAttributes:@{NSFontAttributeName:boldFont}
                                      range:matchRange];
        }
        for (NSTextCheckingResult *aMatch in matches2)
        {
            NSRange matchRange = [aMatch range];
            [attributedString setAttributes:@{NSFontAttributeName:italicizedFont}
                                      range:matchRange];

        }

    [self.someLabel setAttributedText: attributedString];