iOS 開發 右滑返回上一級控制器

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#import <objc/runtime.h>

@interface UINavigationController (Transition)<UIGestureRecognizerDelegate>

 

- (void)transitionPanGestureDidLoad;

 

@end

 

@interface DLNavigationTransition ()

 

@end

 

@implementation DLNavigationTransition

 

/**

 *  啟動右滑pop

 */

+ (void)enableNavigationTransitionWithPanGestureBack

{

 

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        

        Method viewDidLoadMethod = class_getInstanceMethod([UINavigationController class], @selector(viewDidLoad));

        Method transitionPanGestureDidLoadMethod = class_getInstanceMethod([UINavigationController class], @selector(transitionPanGestureDidLoad));

        

        method_exchangeImplementations(viewDidLoadMethod, transitionPanGestureDidLoadMethod);

        

    });

}

 

@end

 

 

@implementation UINavigationController (Transition)

 

- (void)transitionPanGestureDidLoad

{    

    if ([self isKindOfClass:[UINavigationController class]])

    {

        

        [self transitionPanGestureDidLoad];

 

        

        //1.擷取系統interactivePopGestureRecognizer對象的target對象

        id target = self.interactivePopGestureRecognizer.delegate;

        //2.建立滑動手勢，taregt設定interactivePopGestureRecognizer的target，所以當介面滑動的時候就會自動調用target的action方法。

        //handleNavigationTransition是私人類_UINavigationInteractiveTransition的方法，系統主要在這個方法裡面實現動畫的。

        UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] init];

        [pan addTarget:target action:NSSelectorFromString(@"handleNavigationTransition:")];

        //3.設定代理

        pan.delegate = self;

        //4.添加到導航控制器的視圖上

        [self.view addGestureRecognizer:pan];

        

        //5.禁用系統的滑動手勢

        self.interactivePopGestureRecognizer.enabled = NO;

    }

}

 

#pragma mark - 滑動開始會觸發

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer

{

    UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)gestureRecognizer;

    

    CGPoint translat = [pan translationInView:pan.view];

    if (translat.x < 0 ) {

        return NO;

    }

    //只有導航的根控制器不需要右滑的返回的功能。

    if (self.viewControllers.count <= 1)

    {

        

        return NO;

    }

    

    return YES;

}

 

@end

 //直接上代碼  等你來拷貝

iOS 開發 右滑返回上一級控制器