iOS 循环创建自适应宽度button

屏幕快照 2018-11-19 下午2.53.37.png

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 whiteColor];
    
    button.layer.masksToBounds = YES;
    
    button.layer.cornerRadius = 25/2;
    
    [button.layer setBorderColor:[UIColor colorWithRed:51/255.0 green:141/255.0 blue:188/255.0 alpha:1].CGColor];
    
    [button.layer setBorderWidth:1];
    
    [button addTarget:self action:@selector(handleClick:) forControlEvents:UIControlEventTouchUpInside];
    
    [button setTitleColor:[UIColor colorWithRed:51/255.0 green:141/255.0 blue:188/255.0 alpha:1] 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 + 35, 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 + 35> self.view.frame.size.width){
        
        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 + 35, 30);//重设button的frame
        
    }
    
    w = button.frame.size.width + button.frame.origin.x;
    
    [self.view addSubview:button];
    
}

• (void)handleClick:(UIButton *)btn{

  NSLog(@"%ld",btn.tag);

}