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(, SCREEN_HEIGHT--, SCREEN_WIDTH, );
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(, 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:] range:rangeCenter];
[attributeStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:] 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 -= ;
} completion:^(BOOL finished) {
[self performSelector:@selector(hiddenShowWayView) withObject:nil afterDelay:];
}]; } - (void)hiddenShowWayView{
[UIView animateWithDuration:0.35 animations:^{
_wayLabel.mkY += ;
} completion:^(BOOL finished) { }];
}