在为 iOS 中的特定范围向 NSMutableAttributedString 添加属性时出现崩溃答案

【问题标题】：Getting crash while adding attributes to NSMutableAttributedString for a particular range in iOS在为 iOS 中的特定范围向 NSMutableAttributedString 添加属性时出现崩溃
【发布时间】：2017-11-03 10:07:58
【问题描述】：

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]
                                                initWithString:@"I have read, understand and agree to the following terms and conditions and web usage policy." attributes:nil];
NSRange conditionlinkRange = NSMakeRange(50,70);
// for the word "terms and conditions" in the string above
NSRange policylinkRange = NSMakeRange(75,92);
NSDictionary *linkAttributes = @{ NSForegroundColorAttributeName : [UIColor colorWithRed:0.05 green:0.4 blue:0.65 alpha:1.0],
                                  NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle) };
[attributedString addAttributes:linkAttributes range:policylinkRange];
[attributedString addAttributes:linkAttributes range:conditionlinkRange];

应用程序在此行崩溃 [attributedString addAttributes:linkAttributes range:policylinkRange];

【问题讨论】：

请在您的问题中添加更多元素，仅在此处粘贴您的代码不会帮助用户识别您的问题。
我猜？ NSMakeRange(50,70) 应该是 NSMakeRange(50,20)。这是(location, length) 不是(location, end)。其他范围也有同样的问题
谢谢，使用结束字符索引而不是长度
NSMutableAttributedStrings - objectAtIndex:effectiveRange:: Out of bounds的可能重复
您的 Range 长度大于实际长度

标签： ios objective-c

【解决方案1】：

试试这个

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"I have read, understand and agree to the following terms and conditions and web usage policy." attributes:nil];

NSRange conditionlinkRange = NSMakeRange(51,20);
NSRange policylinkRange = NSMakeRange(86,6);
NSDictionary *linkAttributes = @{ NSForegroundColorAttributeName : [UIColor colorWithRed:0.05 green:0.4 blue:0.65 alpha:1.0], NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle) };

[attributedString addAttributes:linkAttributes range:policylinkRange];
[attributedString addAttributes:linkAttributes range:conditionlinkRange];

【讨论】：

【解决方案2】：

使用这个：

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"I have read, understand and agree to the following terms and conditions and web usage policy." attributes:nil];
    NSRange conditionlinkRange = [attributedString.string rangeOfString:@"terms and conditions"];

    // for the word "terms and conditions" in the string above
    NSRange policylinkRange = [attributedString.string rangeOfString:@"policy"];
    NSDictionary *linkAttributes = @{ NSForegroundColorAttributeName : [UIColor colorWithRed:0.05 green:0.4 blue:0.65 alpha:1.0],  NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle) };

    [attributedString addAttributes:linkAttributes range:policylinkRange];
    [attributedString addAttributes:linkAttributes range:conditionlinkRange];

【讨论】：