近期須要使用一個標簽頁,尋思自己寫一個demo.

NSArray *arr = @[@"無知",@"風雲變幻",@"施耐庵",@"唉",@"西門吹雪",@"呵呵噠",@"快看看",@"窿窿啦啦",@"一桿禽獸狙",@"合歡花",@"暴走大事件",@"非誠勿擾",@"呵呵呵"];
    CGFloat w = 0;//保存前一個button的寬以及前一個button距離屏幕邊緣的距離
    CGFloat h = 200;//用來控制button距離父視圖的高
    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];
        //依據計算文字的大小
        
        NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:12]};
        CGFloat length = [arr[i] boundingRectWithSize:CGSizeMake(320, 2000) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size.width;
        //為button賦值
        [button setTitle:arr[i] forState:UIControlStateNormal];
        //設置button的frame
        button.frame = CGRectMake(10 + w, h, length + 15 , 30);
        //當button的位置超出屏幕邊緣時換行 320 僅僅是button所在父視圖的寬度
        if(10 + w + length + 15 > 320){
            w = 0; //換行時將w置為0
            h = h + button.frame.size.height + 10;//距離父視圖也變化
            button.frame = CGRectMake(10 + w, h, length + 15, 30);//重設button的frame
        }
        w = button.frame.size.width + button.frame.origin.x;
        [self.view addSubview:button];
    }
點擊事件
- (void)handleClick:(UIButton *)btn{
    NSLog(@"%ld",btn.tag);
}

iOS for循環創建button,button的寬度依據上面的文字來自適應.