自定义MMPopupView出现宽高为0的看过来

[iOS-Kel]

继承MMPopupView自定义的view，在执行show或showWithBlock之后，要么使用masonry设置其宽高约束；要么能通过内容约束计算出view的大小。不能直接设置frame。举个例子：
@interface FKGenderView : MMPopupView
@EnD
@implementation FKGenderView

• (void)show {
  [self showWithBlock:nil];

}

• (void)showWithBlock:(MMPopupCompletionBlock)block {
  [super showWithBlock:block];

  [self mas_makeConstraints:^(MASConstraintMaker *make) {
  make.width.height.equalTo(self.superview);
  }];
  }
  @EnD
  [customPopupVIew mas_makeConstraints:^(MASConstraintMaker *make) {
  make.width.height.equalTo(self.superview);
  }];