如何在IOS中使用HTML.fromhtml？

Question

我想做一个像这样的NSString通知：“你必须支付4.00美元。”。钱有红色。在Android中，我可以使用HTML.formhtml做。但我不知道该怎么做它在IOS.Who可以帮助我？

Answer 1

试试这段代码

CATextLayer *aTextLayer_= [[[CATextLayer alloc]init] autorelease];
    aTextLayer_.frame = CGRectMake(10, 100, 300, 50);
    aTextLayer_.backgroundColor=[UIColor clearColor].CGColor;
    aTextLayer_.foregroundColor = [[UIColor redColor] CGColor];
    aTextLayer_.alignmentMode=kCAAlignmentCenter;
    aTextLayer_.contentsScale = [[UIScreen mainScreen] scale];
    aTextLayer_ .wrapped=YES;
    [aTextLayer_ setAlignmentMode:kCAAlignmentLeft];

    UIFont *smallFont = [UIFont systemFontOfSize:25];
    CTFontRef ctSmallFont = CTFontCreateWithName((CFStringRef)smallFont.fontName, smallFont.pointSize, NULL);

    UIFont *boldFont = [UIFont systemFontOfSize:25];
    CTFontRef ctBoldFont = CTFontCreateWithName((CFStringRef)boldFont.fontName, boldFont.pointSize, NULL);

    CGColorRef cgColor = [UIColor greenColor].CGColor;
    CGColorRef cgColor1 = [UIColor redColor].CGColor;

    NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                (id)ctSmallFont, (id)kCTFontAttributeName,
                                cgColor, (id)kCTForegroundColorAttributeName, nil];

    NSDictionary *subattributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                   (id)ctBoldFont, (id)kCTFontAttributeName,
                                   cgColor1, (id)kCTForegroundColorAttributeName, nil];
    CFRelease(ctBoldFont);
    NSString *subString=@"You must pay 4.00 dollar.";
    NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:subString attributes:attributes];

    [attrStr addAttributes:subattributes range:NSMakeRange(13,4)];
    aTextLayer_.string=attrStr;
    [self.view.layer addSublayer:aTextLayer_];

Answer 2

如果您不想使用UIWebView，则最佳选择是使用NSAttributedString。

一个天真的实现，没有太多关于角落案例和错误检查，就像

NSString * string = @"You must pay 4.00 dollar";
NSString * pattern = @"You must pay (.+) dollar";
NSRegularExpression * regex = [[NSRegularExpression alloc] initWithPattern:pattern options:0 error:NULL];
NSArray * matches = [regex matchesInString:string options:0 range:NSMakeRange(0, string.length)];
NSRange priceRange = [matches[0] rangeAtIndex:1];
NSMutableAttributedString * attrString = [[NSMutableAttributedString alloc] initWithString:string];
[attrString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:priceRange];

请注意，我假设您的模式始终为You must pay (.+) dollar。如果它不同，只需调整正则表达式，以便检索需要风格化的子字符串的NSRange。

然后，您可以将属性字符串用作接受NSAttributedString的任何内容，例如UILabel自iOS 6起具有attributedText属性，因此您可以执行类似

yourLabel.attributedText = attrString;

Answer 3

您可以将HTML代码添加到UIWebView

  [_webView loadHTMLString:@"<p>You must pay <font color=\"red\">4.00</font> dollar. </p> " baseURL:nil];

试试这段代码

----------------- Alternate Option ----------------------------

如果要修复此文本格式（您必须支付XXXX.XXX美元。）更好创建自定义组件

1. 创建类扩展UIView
2. 使用不同的字体颜色添加UILable