[移动开发]ios UIButton内边距理解

button设置内边距:
UIButton结构,? ImageView+ Lable ? 设置内边距EdgeInsets 以后会 压缩 在宽高,和前端中设置?div内边距一样

?backButton.imageEdgeInsets=UIEdgeInsetsMake(10, 0, 0, 0) ? // 上边内边距10 ，设置ImageView内边距

backButton.titleEdgeInsets=UIEdgeInsetsMake(0, 0, 10, 0); ??// 设置label内边距

backButton.contentEdgeInsets = UIEdgeInsetsMake(10,0, 0, 0); ?// 设置button内边距

backButton.contentEdgeInsets = UIEdgeInsetsMake(-10,0, 0, 0);? ?如果设置负数效果,设置button内边距