场景 ： 电商类APP弹出选择商品尺码，颜色
方法：在要present的出来的 VC 里面写
、、、
- （bo o l）returnYes{
}
、、、
- (instancetype)initWithNibName:(NSString*)nibNameOrNil bundle:(NSBundle*)nibBundleOrNil{
self= [superinitWithNibName:nibNameOrNilbundle:nibBundleOrNil];
if(self) {
self.view.backgroundColor= [[UIColorblackColor]colorWithAlphaComponent:0];
self.modalPresentationStyle=UIModalPresentationOverCurrentContext;
[UIViewanimateWithDuration:0.3animations:^{
self.view.backgroundColor= [[UIColorblackColor]colorWithAlphaComponent:0.5];
}];
}
returnself;
}
