UIViewController 的 presentedViewController 和 presentingViewController

標籤：

#import "TestViewController.h"#import "OneViewController.h"

在TextViewController寫入點擊事件：

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    [self click];}

- (void)click{    OneViewController * vc = [OneViewController new];        [self presentViewController:vc animated:YES completion:nil];            NSLog(@"%@",NSStringFromClass([self.presentationController class]));    NSLog(@"%@",NSStringFromClass([self.presentedViewController class]));    NSLog(@"%@",NSStringFromClass([self.presentingViewController class]));        NSLog(@"%@",NSStringFromClass([vc.presentationController class]));    NSLog(@"%@",NSStringFromClass([vc.presentedViewController class]));    NSLog(@"%@",NSStringFromClass([vc.presentingViewController class]));    }

列印結果：

2015-10-07 11:49:38.933 ceshi[2610:61561] _UIFullscreenPresentationController2015-10-07 11:49:38.933 ceshi[2610:61561] OneViewController2015-10-07 11:49:38.933 ceshi[2610:61561] (null)2015-10-07 11:49:38.934 ceshi[2610:61561] _UIFullscreenPresentationController2015-10-07 11:49:38.934 ceshi[2610:61561] (null)2015-10-07 11:49:38.934 ceshi[2610:61561] TestViewController

在OneViewController的ViewDidAppear寫入：

- (void)viewDidAppear:(BOOL)animated{        NSLog(@"%@",NSStringFromClass([self.presentationController class]));    NSLog(@"%@",NSStringFromClass([self.presentedViewController class]));    NSLog(@"%@",NSStringFromClass([self.presentingViewController class]));    }

列印結果：

2015-10-07 11:49:39.437 ceshi[2610:61561] _UIFullscreenPresentationController2015-10-07 11:49:39.437 ceshi[2610:61561] (null)2015-10-07 11:49:39.437 ceshi[2610:61561] TestViewController

總結：

presented 和 presenting 都是相對於當前UIViewController自己的。

我的理解，presented就是當前UIViewController有權利彈出的VC對象，presenting就是把當前UIViewController給彈出的對象。

我再理解了一下，presented就是當前UIViewController的兒子

　　　　　　　　presenting就是當前UIViewController的老子

 

以上都是我的理解，希望前輩指點

UIViewController 的 presentedViewController 和 presentingViewController