IOS iOS8 new Features--uipresentationcontroller

1. The role of Uipresentationcontroller

1> manages all modal out of the controller

2> management Through this method-(void) Presentviewcontroller: (Uiviewcontroller *) Animated: (BOOL) completion:^ (void) completion; The controller shown

3> Management \ Monitor the process of switching controllers

2. The role of Uipresentationcontroller

1> Controller Once the present method is tuned, the controller's Presentationcontroller will be created first, then the entire controller switch is managed by Presentationcontroller

-(void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event{

Secondviewcontroller *VC = [[Secondviewcontroller alloc]init];

[Self PRESENTVIEWCONTROLLER:VC animated:yes completion:nil];

}

The 2> controller has 2 properties: Presentationcontroller and Poppverpresentationcontroller

The following scenario Vc.modalpresentationstyle = Uimodalpresentationformsheet, in which case poppverpresentationcontroller = Nil

3> set the controller to switch in Popver mode.

That is to say Vc.modalpresentationstyle = Uimodalpresentationpopover, the controller's Popoverpresentationcontroller attribute is no longer nil.

and Popoverpresentationcontroller and Presentationcontroller point to the same object, pointing to the Uipopoverpresentationcontroller class object

Note: The 1>uipopoverpresentationcontroller class inherits from the Uipresentationcontroller class

2> the parent class pointer can point to the subclass, so presentationcontroller points to the Uipopoverpresentationcontroller object, no problem

4> controller Presentationcontroller and Popoverpresentationcontroller adopt lazy loading way, the following code, VC controller is not popover out.

Secondviewcontroller *VC = [[Secondviewcontroller alloc]init];

//Presentationcontroller Get method was tuned before Vc.popoverPresentationController.sourceView = self.segmented

Vc.presentationcontroller;

Vc.modalpresentationstyle = Uimodalpresentationpopover;

Vc.popoverPresentationController.sourceView = self.segmented;

[Self PRESENTVIEWCONTROLLER:VC animated:yes completion:nil];

IOS iOS8 new Features--uipresentationcontroller