变更记录

方案名称

UILabel - 显示多格式文本

关键字

UILabel \ NSMutableAttributedString \ attributedText \ 批量替换

需求场景

1. 需要显示一段多格式的文本
2. 批量替换子字符串显示格式

参考链接

1. Stack Overflow - Change attributes of substrings in a NSAttributedString

详细内容

1. Objective-C 示例

显示富文本格式

NSString *plainText = [NSString stringWithFormat:@"%@ test", @"click"];
NSMutableAttributedString *styleText = [[NSMutableAttributedString alloc] initWithString:plainText];
NSDictionary *attr = @{NSFontAttributeName: [UIFont systemFontOfSize:15],NSForegroundColorAttributeName : [UIColor redColor]};
NSRange nameRange = [plainText rangeOfString:aInfo.title];
[styleText setAttributes:attr range:nameRange];
self.labelInfo.attributedText = styleText;

批量替换子字符串显示格式

定义:

- (NSMutableAttributedString *)setSubString:(NSString*)substring inString:(NSMutableAttributedString *)mutableAttributedString withColor:(UIColor *)color andFont:(UIFont *)font
{
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:[NSString stringWithFormat:@"(%@)",substring] options:kNilOptions error:nil];

    NSString *string = [mutableAttributedString string];

    NSRange range = NSMakeRange(0,string.length);

    [regex enumerateMatchesInString:string options:kNilOptions range:range usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {

        NSRange subStringRange = [result rangeAtIndex:1];
        [mutableAttributedString addAttribute:NSForegroundColorAttributeName value:color range:subStringRange];
        [mutableAttributedString addAttribute:NSFontAttributeName value:font range:subStringRange];
    }];

    return mutableAttributedString;
}

使用:

NSMutableAttributedString *mString = [[NSMutableAttributedString alloc] initWithString:@"This is the text and i want to replace something and stuff and stuff"];

mString = [self setSubString:@"stuff" inString:mString withColor:[UIColor greenColor] andFont:[UIFont systemFontOfSize:14.0]];
mString = [self setSubString:@"and" inString:mString withColor:[UIColor redColor] andFont:[UIFont systemFontOfSize:14.0]];

self.labelInfo.attributedText = mString;

效果:

2. Swift 示例

示例1

var plainText = title! + " button pressed";
var styleText = NSMutableAttributedString(string: plainText);
var attributes : NSDictionary = [NSFontAttributeName : UIFont.boldSystemFontOfSize( statusLabel.font.pointSize )]
let nameRange : NSRange  = (plainText as NSString).rangeOfString(title!);
//styleText.setAttributes(attributes, ))
styleText.setAttributes(attributes, range: nameRange);
statusLabel.attributedText = styleText;

示例2

func attributedString(plainText : NSString, sString : NSString) -> NSMutableAttributedString
{
    var styleText = NSMutableAttributedString(string: plainText)
    var font : UIFont = UIFont(name: "Helvetica-BoldOblique", size: 13.0)!
    var color : UIColor = COLOR_ORANGE
    var attrs = [NSFontAttributeName : font, NSForegroundColorAttributeName : color]
    let nameRange : NSRange  = (plainText as NSString).rangeOfString(sString)
    styleText.setAttributes(attrs, range: nameRange)
    return styleText
}

效果图

（无）

备注

• UILabel \ UITextField - 设置行间距等富文本属性