通过类别和继承方式实现按钮的图片和标题布局，调整 UIButton的imageEdgeInsets 和titleEdgeInsets属性
使用代码或者在Interface Builder调整 edgeInsetsStyle (HYButtonEdgeInsetsStyle 枚举) 和 imageTitleSpace (CGFloat) 两个属性
// edgeInsetsStyle
typedef NS_ENUM(NSUInteger, HYButtonEdgeInsetsStyle) {
HYButtonEdgeInsetsStyleImageLeft,
HYButtonEdgeInsetsStyleImageRight,
HYButtonEdgeInsetsStyleImageTop,
HYButtonEdgeInsetsStyleImageBottom
};
// imageTitleSpace 为图片标题间距
- (void)layoutButtonWithEdgeInsetsStyle:(ButtonEdgeInsetsStyle)style imageTitlespace:(CGFloat)space;
// style
typedef NS_ENUM(NSUInteger, ButtonEdgeInsetsStyle) {
ButtonEdgeInsetsStyleImageLeft,
ButtonEdgeInsetsStyleImageRight,
ButtonEdgeInsetsStyleImageTop,
ButtonEdgeInsetsStyleImageBottom
};
// space为图片标题间距
