[iOS]UIButton内、外边距设置

    - (void)viewDidLoad {

        [super viewDidLoad];

        /*

         UIButton设置对应的边距image跟title的边距属性

            titleEdgeInsets     内边距

            contentEdgeInsets   外边距

         */

        // {top, left, bottom, right}

        _twoBut.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 10);

        _threeBut.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 10);

        _fourBut.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 10);

        _fourBut.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 10);

        _fiveBut.imageEdgeInsets = UIEdgeInsetsMake(10, 10, 0, 0);

        _sixBut.imageEdgeInsets = UIEdgeInsetsMake(0, _sixBut.titleLabel.intrinsicContentSize.width, 0, -_sixBut.titleLabel.intrinsicContentSize.width);

        _sixBut.titleEdgeInsets = UIEdgeInsetsMake(0, -_sixBut.currentImage.size.width, 0, _sixBut.currentImage.size.width);

    }