iphone怎么实现左滑返回

iphone怎么实现左滑返回

可以通过在UINa vigationController中设置interactivePopGestureRecognizer的delegate来实现左滑返回功能。具体步骤如下：
1. 在UINa vigationController的子类中设置interactivePopGestureRecognizer的delegate为自己。
2. 实现UIGestureRecognizerDelegate协议中的gestureRecognizerShouldBegin方法，判断当前是否可以进行左滑返回操作。
3. 在需要支持左滑返回的UIViewController中设置na vigationController的delegate为UINa vigationController的子类。
示例代码如下：
```
// UINa vigationController的子类
@interface CustomNa vigationController : UINa vigationController
@end
@implementation CustomNa vigationController
- (void)viewDidLoad {
[super viewDidLoad];
// 设置interactivePopGestureRecognizer的delegate为自己
self.interactivePopGestureRecognizer.delegate = self;
}
#pra gma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
// 判断当前是否可以进行左滑返回操作
return self.viewControllers.count > 1;
}
@end
// 需要支持左滑返回的UIViewController
@interface CustomViewController : UIViewController
@end
@implementation CustomViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 设置na vigationController的delegate为CustomNa vigationController的子类
self.na vigationController.delegate = (CustomNa vigationController *)self.na vigationController;
}
@end
```