自定义一个NavigationController
- (void)viewDidLoad {
[super viewDidLoad];
UIGestureRecognizer *gesture = self.interactivePopGestureRecognizer;
gesture.enabled = NO;
UIView *gestureView = gesture.view;
UIPanGestureRecognizer *popRecognizer = [[UIPanGestureRecognizer alloc] init];
popRecognizer.delegate = self;
popRecognizer.maximumNumberOfTouches = 1;
[gestureView addGestureRecognizer:popRecognizer];
#elif USE_方案0
/**
* 获取系统手势的target数组
*/
NSMutableArray *_targets = [gesture valueForKey:@"_targets"];
/**
* 获取它的唯一对象，我们知道它是一个叫UIGestureRecognizerTarget的私有类，它有一个属性叫_target
*/
id gestureRecognizerTarget = [_targets firstObject];
/**
* 获取_target:_UINavigationInteractiveTransition，它有一个方法叫handleNavigationTransition:
*/
id navigationInteractiveTransition = [gestureRecognizerTarget valueForKey:@"_target"];
/**
* 通过前面的打印，我们从控制台获取出来它的方法签名。
*/
SEL handleTransition = NSSelectorFromString(@"handleNavigationTransition:");
/**
* 创建一个与系统一模一样的手势，我们只把它的类改为UIPanGestureRecognizer
*/
[popRecognizer addTarget:navigationInteractiveTransition action:handleTransition];
}
实现代理
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
/**
* 这里有两个条件不允许手势执行，1、当前控制器为根控制器；2、如果这个push、pop动画正在执行（私有属性）
*/
return self.viewControllers.count != 1 && ![[self valueForKey:@"_isTransitioning"] boolValue];
}
