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

一时失言乱红尘 2022-08-02 14:38 294阅读 0赞

## 最近需要使用一个标签页,寻思自己写一个demo. ##

标签的大小根据上面的文字来自适应大小,需要根据后台返回的数据自动换行.没有添加

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);
    }

![20150723163903253][]

[20150723163903253]: /images/20220731/8cd695b5134c401b88d21a12c0fd3b3f.png