button按钮的tittle 折行且居中显示

    

    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    button.frame = CGRectMake(40, 100, 200, 100);

    button.titleLabel.numberOfLines = 2; //多行显示

    button.titleLabel.textAlignment = NSTextAlignmentCenter; //设置居中

    [button setTitle:@"西班牙文网\nkjfdka" forState:UIControlStateNormal];//注意要这行的标记\n 

    [self.view addSubview:button];

显示如下：