For循环创建自适应宽度和自动换行的button

NSArray *arr = @[@无知,@风云变幻,@施耐庵,@唉,@西门吹雪,@呵呵哒,@快看看,@窿窿啦啦,@一杆禽兽狙,@合欢花,@暴走大事件,@非诚勿扰,@呵呵呵];

CGFloat w = 0;//保存前一个button的宽以及前一个button距离屏幕边缘的距离
CGFloat h = 200;//用来控制button距离父视图的高
for (int i = 0; i < arr.count; i++) {

        UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
        button.tag = 100 + i;
        button.backgroundColor = [UIColor greenColor];
        [button addTarget:self action:@selector(handleClick:) forControlEvents:UIControlEventTouchUpInside];
        [button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
        //根据计算文字的大小
         
        NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:12]};
        CGFloat length = [arr[i] boundingRectWithSize:CGSizeMake(320, 2000) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size.width;
        //为button赋值
        [button setTitle:arr[i] forState:UIControlStateNormal];
        //设置button的frame
        button.frame = CGRectMake(10 + w, h, length + 15 , 30);
        //当button的位置超出屏幕边缘时换行 320 只是button所在父视图的宽度
        if(10 + w + length + 15 > 320){
            w = 0; //换行时将w置为0
            h = h + button.frame.size.height + 10;//距离父视图也变化
            button.frame = CGRectMake(10 + w, h, length + 15, 30);//重设button的frame
        }
        w = button.frame.size.width + button.frame.origin.x;
        [self.view addSubview:button];

}

点击事件
- (void)handleClick:(UIButton *)btn{
    NSLog(@%ld,btn.tag);
}