iOS for循环创建button,button的宽度依据上面的文字来自适应.

近期须要使用一个标签页,寻思自己写一个demo.

标签的大小依据上面的文字来自适应大小,须要依据后台返回的数据自己主动换行.没有加入

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];

        //依据计算文字的大小

        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 仅仅是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);

}