iOS —label自动换行

UILabel *label = [[UILabel alloc]initWithFrame:frame];
label.text = tileName;
//背景颜色为红色
label.backgroundColor = [UIColor redColor];
//设置字体颜色为白色
label.textColor = [UIColor whiteColor];
//文字居中显示
label.textAlignment = UITextAlignmentCenter;
//自动折行设置
label.lineBreakMode = UILineBreakModeWordWrap;
label.numberOfLines = 0;
[self.collectionView addSubview:label];