iOS_Label上文字不同颜色设置

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UILabel *notiLabel=[[UILabel alloc]init];

    NSMutableAttributedString *str=[[NSMutableAttributedString alloc]initWithString:NSLocalizedString(@"air_notice", nil)];
    CGFloat notiLabelY=CGRectGetMaxY(goAirport.frame)+25;
    CGFloat notiLabelW=SCREEN_W-15*2;
    CGSize   notiLabelWH=[NSLocalizedString(@"air_notice", nil) sizeWithFont:[UIFont systemFontOfSize:18] WithSize:CGSizeMake(notiLabelW, MAXFLOAT)];
    notiLabel.frame=(CGRect){{20,notiLabelY},notiLabelWH};
    notiLabel.numberOfLines=0;
    notiLabel.textColor=[UIColor colorWithHex:GRAY_COLOR alpha:1.0];
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(5, 4)];
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(10, 4)];
    [str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial-BoldItalicMT" size:18.0] range:NSMakeRange(5, 4)];
    [str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial-BoldItalicMT" size:18.0] range:NSMakeRange(10, 4)];
    notiLabel.attributedText=str;

[self addSubview:notiLabel];

//注意：先设置整个字符串的字体、颜色，然后对某部分字符串进行字体、颜色的重新设置。

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