iOS-自定義導(dǎo)航欄后側(cè)滑返回失效

從iOS7開始，系統(tǒng)為UINavigationController提供了一個interactivePopGestureRecognizer用于右滑返回(pop),但是，如果自定了當前視圖控制器leftBarButtonItem，或自定義導(dǎo)航欄后該手勢就失效了。

解決方法：

自定義UINavigationController，實現(xiàn)其代理方法:

#import "DYNavigationController.h"

@interface DYNavigationController () <UINavigationControllerDelegate>

@property (nonatomic,strong) id popDelegate;

@end

@implementation DYNavigationController

- (void)viewDidLoad {
    [super viewDidLoad];
    //代理
    self.popDelegate = self.interactivePopGestureRecognizer.delegate;
    self.delegate = self;
}

#pragma UINavigationControllerDelegate方法
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    //實現(xiàn)滑動返回功能
    //清空滑動返回手勢的代理就能實現(xiàn)
    self.interactivePopGestureRecognizer.delegate =  viewController == self.viewControllers[0]? self.popDelegate : nil;
}

@end

控制器添加ScrollView后側(cè)滑返回失效

大概思路就是，既然你攔截了我的手勢，那我就要想辦法讓手勢傳遞下去，不被你攔截，所以最后的解決辦法就是對Scrollview加個Category，重寫它代理的方法，讓手勢能夠傳遞下去

解決方法：

自定義UIScrollView的分類，重寫代理方法:

#import "UIScrollView+DY.h"

@implementation UIScrollView (DY)

#define KScreenHeight [UIScreen mainScreen].bounds.size.height //屏幕的高度
#define KScreenWidth [UIScreen mainScreen].bounds.size.width // 屏幕的寬度
//是否支持多手勢觸發(fā)，返回YES，則可以多個手勢一起觸發(fā)方法，返回NO則為互斥.
//是否允許多個手勢識別器共同識別，一個控件的手勢識別后是否阻斷手勢識別繼續(xù)向下傳播，默認返回NO；如果為YES，響應(yīng)者鏈上層對象觸發(fā)手勢識別后，如果下層對象也添加了手勢并成功識別也會繼續(xù)執(zhí)行，否則上層對象識別后則不再繼續(xù)傳播
//一句話總結(jié)就是此方法返回YES時，手勢事件會一直往下傳遞，不論當前層次是否對該事件進行響應(yīng)。
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    
    if ([self panBack:gestureRecognizer]) {
        return YES;
    }
    return NO;
    
}

//location_X可自己定義,其代表的是滑動返回距左邊的有效長度
- (BOOL)panBack:(UIGestureRecognizer *)gestureRecognizer {
    
    //是滑動返回距左邊的有效長度
    int location_X = 0.15*KScreenWidth;
    
    if (gestureRecognizer == self.panGestureRecognizer) {
        UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)gestureRecognizer;
        CGPoint point = [pan translationInView:self];
        UIGestureRecognizerState state = gestureRecognizer.state;
        if (UIGestureRecognizerStateBegan == state ||UIGestureRecognizerStatePossible == state) {
            CGPoint location = [gestureRecognizer locationInView:self];
            
            //這是允許每張圖片都可實現(xiàn)滑動返回
            //int temp1 = location.x;
            //int temp2 = KScreenWidth;
            //NSInteger XX = temp1 % temp2;
            //if (point.x > 0 && XX < location_X) {
            //    return YES;
            //}
            //下面的是只允許在第一張時滑動返回生效
            if (point.x > 0 && location.x < location_X && self.contentOffset.x <= 0) {
                return YES;
            }
        }
    }
    return NO;
}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
    if ([self panBack:gestureRecognizer]) {
        return NO;
    }
    return YES;
    
}

@end