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环境xcode7.3 ios9.3 真机模拟器均出现 UIButton的titleLabe setAttributeSting 首次不起作用，之后每一次 都正常，百思不得解，无奈之下改变策略，讲button title设置空，就是不设置title，另外加一个Label 把要设置 attributeString 设置在单独label 上，再加Btn aad 在label上，Button 与 Label 大小相等。完美解决button titleLabel setAttributeSting首次不起作用的问题.
code 如下：
#pragma mark 显示最近地铁站路线 - (void)showWayToStationWithStation:(SubwayStationModel *)station from:(CLLocationCoordinate2D) coordinate distance:(double)distance{ _wayLabel.frame = CGRectMake(0, SCREEN_HEIGHT-49-64, SCREEN_WIDTH, 80); NSString *title = [NSString stringWithFormat:@"距离最近的地铁站\n%@ %ld米\n查看步行线路",station.stationName,(long)distance]; [_wayLabel setText:title]; NSString *string = title; NSRange rangeLeft = [title rangeOfString:@"距离最近的地铁站"]; NSRange rangeRight = [title rangeOfString:@"查看步行线路"]; NSRange rangeCenter = NSMakeRange(rangeLeft.length, rangeRight.location - rangeLeft.length); NSRange rangeAll = NSMakeRange(0, title.length); NSMutableAttributedString *attributeStr = [[NSMutableAttributedString alloc] initWithString:string]; [attributeStr addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:0.087 green:0.024 blue:0.023 alpha:1.000] range:rangeLeft]; [attributeStr addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:1.000 green:0.288 blue:0.268 alpha:1.000] range:rangeCenter]; [attributeStr addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:0.043 green:0.431 blue:0.046 alpha:1.000] range:rangeRight]; [attributeStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:17] range:rangeCenter]; [attributeStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:17] range:rangeRight]; NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init]; style.lineSpacing = 2.5; style.alignment = NSTextAlignmentCenter; [attributeStr addAttribute:NSParagraphStyleAttributeName value:style range:rangeAll]; [_wayLabel setAttributedText:attributeStr]; [UIView animateWithDuration:0.35 animations:^{ _wayLabel.mkY -= 80; } completion:^(BOOL finished) { [self performSelector:@selector(hiddenShowWayView) withObject:nil afterDelay:3]; }]; } - (void)hiddenShowWayView{ [UIView animateWithDuration:0.35 animations:^{ _wayLabel.mkY += 80; } completion:^(BOOL finished) { }]; }
UIButton的titleLabe setAttributeSting 首次不起作用
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原文地址：http://www.cnblogs.com/zhujin/p/5632010.html
