Android NavigationController Swipe Right Gesture Details

Apple has always tried its best to achieve the ultimate in human-computer interaction. In iOS7, a small feature has been added, which is this api: = YES;

This API function is that the UIViewController in the NavigationController stack can support the right swipe gesture, that is, you don’t need to click the return button in the upper right corner. Swipe gently on the left side of the screen, and the screen will return. As the screen of the iOS device increases, this small function allows people with short fingers, big thumbs and disabled hands to see the blessing.

This function is good, but we often have to customize the return button. If the return button is manually customized, this function will be invalid, that is, the leftBarButtonItem of the navigationItem is customized, and this gesture will be invalid.

Two solutions are found

1. Reset the delegate of the gesture

2. Of course, you can also respond to the event of this gesture by yourself.

There are more ways to add to it later. Here you can choose according to your needs. If you simply customize the return button, the first one is the simplest, and you can get it done with just one sentence of code.

Question 2: iOS development swipe right gesture to achieve return. How to set it in NavigationController

Implement the right swipe in navigationController Return function

The backbarbuttonitem provided by the system can realize the right-slide back function without adding any code. However, when you often need to modify the style of the button, you need to customize the leftbarbuttonitem. Slide to the right at this time and then fail to swipe to the right. This problem can be solved by the following method. (I have personally experimented)

It is mainly through setting some properties of this gesture. You can view the instructions through SDK. I won't go into details here.

1. = YES | NO;      Whether the gesture is valid or not

2. = self;                                                                                                                            �

The default setting in the viewcontroller is YES, which means that the gesture is valid. After setting the attribute in 2, the current viewcontroller can realize the right-slide back function, but when you return to the rootView of the navigationController, it will cause problems with the program (when pushing the subcontroller again, the program is stuck in the current interface and cannot jump). The effective solution is as follows:

Description: There are two controllersA and B

navigationControllerofrootviewSet asA,existAAfter clicking the buttonpush B.existAof -(void)viewDidAppear:(BOOL)animatedAdded to the method = NO;The code is as follows:
- (void)viewDidAppear:(BOOL)animated
{
  if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {
     = NO;  //Let rootView not slide  }
}

Then add the - (void)viewDidLoad method in B

- (void)viewDidLoad
{
  //Configure the return button  UIBarButtonItem * backItem = [self barButtonForImageNames:@[@"icon-return", @"", @""] action:@selector(popBack)];
   = @"";
  if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {
     = YES;
     = self;
  }
   = backItem;

  if ([[[UIDevice currentDevice] systemVersion] floatValue]
 >= 7.0) {

     = self; 
  }
}

This ensures that when you slide right in A and push B again, you won't get stuck in the A interface.

In the project, we usually create a unified style interface, and generally create a basic viewcontroller. This viewcontroller extends a method to configure leftbarbutton, and adds the code in B's viewDidLoad to this method. In this way, while creating the leftbarbutton, the return operation is directly added (without adding such a piece of code to each viewController). Then, only add A's (void) viewDidAppear:(BOOL) animated method to the rootView of navigationController.

The above content is a detailed explanation of the Android NavigationController swipe right gesture. I hope you like it.