用導(dǎo)航控制器 自定義返回按鈕時(shí)側(cè)滑返回手勢(shì)會(huì)失效

通常我們會(huì)在自定義了返回按鈕的控制器中去開啟手勢(shì)和設(shè)置代理
如果要修改很多頁(yè)面的話很麻煩
所以用runtime進(jìn)行全局修改。

新建UIViewController的類別

在.m文件中導(dǎo)入#import <objc/runtime.h>然后添加如下代碼就可以了：

+ (void)load{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
//      把viewDidLoad、viewDidAppear:、viewWillDisappear:替換成自定義的方法
        Method viewDidLoadImp = class_getInstanceMethod(self, @selector(viewDidLoad));
        Method cbi_viewDidLoadImp = class_getInstanceMethod(self, @selector(cbi_viewDidLoad));
        method_exchangeImplementations(viewDidLoadImp, cbi_viewDidLoadImp);
        
        Method viewDidAppearImp = class_getInstanceMethod(self, @selector(viewDidAppear:));
        Method cbi_viewDidAppearImp = class_getInstanceMethod(self, @selector(cbi_viewDidAppear:));
        method_exchangeImplementations(viewDidAppearImp, cbi_viewDidAppearImp);
        
        Method viewWillDisappearImp = class_getInstanceMethod(self, @selector(viewWillDisappear:));
        Method cbi_viewWillDisappearImp = class_getInstanceMethod(self, @selector(cbi_viewWillDisappear:));
        method_exchangeImplementations(viewWillDisappearImp, cbi_viewWillDisappearImp);
    });
}

- (void)leftItemClick {
    [self.navigationController popViewControllerAnimated:YES];
}

//自定義的方法，進(jìn)行按鈕自定義、手勢(shì)的開關(guān)、手勢(shì)代理設(shè)置
- (void)cbi_viewDidLoad {
    
    //不在一級(jí)界面時(shí)添加自定義按鈕
    if ([self.navigationController.viewControllers count] > 1) {
        //在這里自定義你需要的全局返回按鈕
        UIBarButtonItem * leftItem = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"返回"] style:UIBarButtonItemStylePlain target:self action:@selector(leftItemClick)];
        self.navigationItem.leftBarButtonItem = leftItem;
        
    }
    
    [self cbi_viewDidLoad];
}

- (void)cbi_viewDidAppear:(BOOL)animated {
    
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        if ([self.navigationController.viewControllers count] > 1) {
            self.navigationController.interactivePopGestureRecognizer.enabled = YES;
            self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;
        } else {
            self.navigationController.interactivePopGestureRecognizer.enabled = NO;
        }
    }
    
    [self cbi_viewDidAppear:animated];
}

- (void)cbi_viewWillDisappear:(BOOL)animated {
    
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.navigationController.interactivePopGestureRecognizer.delegate = nil;
    }
    [self cbi_viewWillDisappear:animated];
}

在.m的這個(gè)方法中修改你的全局自定義按鈕:

- (void)cbi_viewDidLoad {
    
    //不在一級(jí)界面時(shí)添加自定義按鈕
    if ([self.navigationController.viewControllers count] > 1) {
        //在這里自定義你需要的全局返回按鈕
        UIBarButtonItem * leftItem = [[UIBarButtonItem alloc]
                                        initWithImage:[UIImage imageNamed:@"返回"] 
                                        style:UIBarButtonItemStylePlain 
                                        target:self 
                                        action:@selector(leftItemClick)];

        self.navigationItem.leftBarButtonItem = leftItem;
        
    }
    
    [self cbi_viewDidLoad];
}

因?yàn)槭侨钟绊懙牟挥脤?dǎo)入頭文件就會(huì)生效。

如果想某個(gè)頁(yè)面不用側(cè)滑手勢(shì)返回
就在該控制器的viewDidAppear:做如下操作關(guān)閉側(cè)滑手勢(shì)：

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}

如果要改變某個(gè)控制器的返回按鈕，直接在viewDidLoad中自定義leftBarButtonItem就好了，會(huì)覆蓋全局的。

代碼下載

GitHub：ZBCustomBackItem
下載后直接拖入項(xiàng)目中即可