UIButton自适应创建

NSArray*arr =@[@"无知",@"风云变幻",@"英雄",@"盖伦",@"德玛西亚",@"啊大大",@"快看看",@"窿窿啦啦",@"一杆禽兽狙",@"就发送积分",@"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 = 100;//用来控制button距离父视图的高
for (int i = 0; i < arr.count; i++) {
UIButton *button = [UIButtonbuttonWithType:UIButtonTypeSystem];
button.tag = 100 + i;
button.backgroundColor= [UIColorcolorWithRed:239/255.0green:239/255.0blue:244/255.0alpha:1];
[button addTarget:selfaction:@selector(handleClick:)forControlEvents:UIControlEventTouchUpInside];
[button setTitleColor:[UIColorcolorWithWhite:0.400alpha:1.000]forState:UIControlStateNormal];

 //根据计算文字的大小
NSDictionary *attributes = @{NSFontAttributeName:[UIFontsystemFontOfSize:12]};

CGFloat length = [arr[i] boundingRectWithSize:CGSizeMake(320,2000)options:NSStringDrawingUsesLineFragmentOriginattributes:attributescontext: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);

button.layer.cornerRadius=4;

button.layer.masksToBounds=YES;

//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 > 355){
      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.viewaddSubview:button];