获取button上文字的宽度

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NSDictionary *attributes = @{NSFontAttributeName:[UIFontsystemFontOfSize:17]};

//获取button上文字

NSString *title=[_buttoningtitleForState:UIControlStateNormal];

NSLog(@"button上文字%@",title);

//获取button上文字的宽度（length 是个定义的一个全局变量）

length = [title boundingRectWithSize:CGSizeMake(320, 2000)options:NSStringDrawingUsesLineFragmentOriginattributes:attributes context:nil].size.width;

//白色动画线

UIView *redLine =[[UIViewalloc]initWithFrame:CGRectMake(((K_SCERRN_WIDTH / 2)-length)/2, 0,length, 1)];

[redLine setBackgroundColor:[UIColor whiteColor]];

self.arrowView = redLine;

[_line addSubview:redLine];

button事件

[UIView animateWithDuration:0.25 animations:^{

_arrowView.x = ((K_SCERRN_WIDTH / 2)-length)/2;

}];

[UIView animateWithDuration:0.25 animations:^{

_arrowView.x = _buttonend.x+((K_SCERRN_WIDTH / 2)-length)/2;

}];

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