1、调整image以及title的位置
//顺序是上、左、下、右，比如第一个是title向左移动10，image向右移动10
btn.titleEdgeInsets = UIEdgeInsetsMake(0, -10, 0, 0);
btn.imageEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
2、设置button中title的对齐方式
//纵向对齐方式
typedef NS_ENUM(NSInteger, UIControlContentVerticalAlignment) {
UIControlContentVerticalAlignmentCenter = 0,
UIControlContentVerticalAlignmentTop = 1,
UIControlContentVerticalAlignmentBottom = 2,
UIControlContentVerticalAlignmentFill = 3,
};
//横向对齐方式
typedef NS_ENUM(NSInteger, UIControlContentHorizontalAlignment) {
UIControlContentHorizontalAlignmentCenter = 0,
UIControlContentHorizontalAlignmentLeft = 1,
UIControlContentHorizontalAlignmentRight = 2,
UIControlContentHorizontalAlignmentFill = 3,
};
//例：左对齐
btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
3、读取title的值
NSString *str = [btn titleForState:UIControlStateNormal];
