iOS – UIButton(UIEdgeInsets)/设置button上的文字和图片上下垂直居中对齐

UIEdgeInsets typedef struct UIEdgeInsets { CGFloat top, left, bottom, right; // specify amount to inset (positive) for each of the edges. values can be negative to 'outset' } UIEdgeInsets; 在UIButton中有三个对EdgeInsets的设置:ContentEdgeInsets、titleEdgeInsets、imageEdgeInsets @property(nonatomic) UIEd