自定义全屏返回手势

立即下载用AI写一个

发布时间：2017-11-21

1人 | 浏览：3981次 | 收藏 |

技术：runtime

运行环境：xcode

概述

由于系统提供的返回手势只能在屏幕边缘使用，使用runtime替换方法，用自定义手势打造全屏返回手势。随心所欲的滑

详细

>使用分类，入侵性低，直接拖动到项目中，一句代码都不用写，自动生效

## 演示效果
![](/contentImages/image/20171121/RirEcar85u8tQgktUFj.gif)
## 目录结构
![](/contentImages/image/20171121/UMEWfpJ2T7bfMSP9B9R.jpg)

## 原理
**.h文件**
```objc
/// 自定义全屏拖拽返回手势
@property (nonatomic, strong, readonly) UIPanGestureRecognizer *popGestureRecognizer;
```
定义单个控制器取消手势方法
```objc
- (void)cancleHMFullScreenPopGesRec:(BOOL)cancle;
```

**.m文件**

一、引入头文件``#import <objc/runtime.h>``

二、定义手势代理类
```objc
    // 判断是否是根控制器，如果是，取消手势
    if (self.navigationController.viewControllers.count <= 1) {
        return NO;
    }
    
    // 如果正在转场动画，取消手势
    if ([[self.navigationController valueForKey:@"_isTransitioning"] boolValue]) {
        return NO;
    }
    
    // 判断手指移动方向
    CGPoint translation = [gestureRecognizer translationInView:gestureRecognizer.view];
    if (translation.x <= 0) {
        return NO;
    }
    if (self.isCancle) {
        return NO;
    }
    return YES;
}
```
三、在NCPopGestureRecognizer的类实现中

在load方法中交换navVC的push方法和自定义的方法实例
```objc
+ (void)load {
    
    Method originalMethod = class_getInstanceMethod([self class], @selector(pushViewController:animated:));
    Method swizzledMethod = class_getInstanceMethod([self class], @selector(hm_pushViewController:animated:));
    
    method_exchangeImplementations(originalMethod, swizzledMethod);
}
```
取消的方法调用上边自定义类的属性赋值
```objc
- (void)cancleHMFullScreenPopGesRec:(BOOL)cancle {
  
    [self hm_fullScreenPopGestureRecognizerDelegate].isCancle = cancle;
    
}
```
自定义push方法和手势
根据kvc取值拿到 target 和action添加到自定义手势
并禁用系统交换手势，设置手势代理为自定义类
```objc
- (void)hm_pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    
    if (![self.interactivePopGestureRecognizer.view.gestureRecognizers containsObject:self.popGestureRecognizer]) {
        [self.interactivePopGestureRecognizer.view addGestureRecognizer:self.popGestureRecognizer];
        
        NSArray *targets = [self.interactivePopGestureRecognizer valueForKey:@"targets"];
        id internalTarget = [targets.firstObject valueForKey:@"target"];
        SEL internalAction = NSSelectorFromString(@"handleNavigationTransition:");
        
        self.popGestureRecognizer.delegate = [self hm_fullScreenPopGestureRecognizerDelegate];
        [self.popGestureRecognizer addTarget:internalTarget action:internalAction];
        
        // 禁用系统的交互手势
        self.interactivePopGestureRecognizer.enabled = NO;
    }
    
    if (![self.viewControllers containsObject:viewController]) {
        [self hm_pushViewController:viewController animated:animated];
    }
}
```

用runtime给分类添加属性绑定
```objc
- (HMFullScreenPopGestureRecognizerDelegate *)hm_fullScreenPopGestureRecognizerDelegate {
    HMFullScreenPopGestureRecognizerDelegate *delegate = objc_getAssociatedObject(self, _cmd);
    if (!delegate) {
        delegate = [[HMFullScreenPopGestureRecognizerDelegate alloc] init];
        delegate.navigationController = self;
        
        objc_setAssociatedObject(self, _cmd, delegate, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    }
    return delegate;
}
- (UIPanGestureRecognizer *)popGestureRecognizer {
    UIPanGestureRecognizer *panGestureRecognizer = objc_getAssociatedObject(self, _cmd);
    
    if (panGestureRecognizer == nil) {
        panGestureRecognizer = [[UIPanGestureRecognizer alloc] init];
        panGestureRecognizer.maximumNumberOfTouches = 1;
        
        objc_setAssociatedObject(self, _cmd, panGestureRecognizer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    }
    return panGestureRecognizer;
}
```

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