navigationcontroller手势翻页和navigationbar

一. 系统导航默认手势

#import "CBNavigationController.h"

//手势返回

@interface CBNavigationController ()<UIGestureRecognizerDelegate, UINavigationControllerDelegate>

@end

@implementation CBNavigationController

- (void)viewDidLoad
{
    [super viewDidLoad];
    __weak CBNavigationController *weakSelf = self;
    
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
    {
        self.interactivePopGestureRecognizer.delegate = weakSelf;
        self.delegate = weakSelf;
        
    }
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    
}

// Hijack the push method to disable the gesture

//推进控制器
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
        self.interactivePopGestureRecognizer.enabled = NO;
    
    [super pushViewController:viewController animated:animated];
}

//推出控制器
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
{
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
        self.interactivePopGestureRecognizer.enabled = YES;
    return [super popViewControllerAnimated:animated];
}

#pragma mark UINavigationControllerDelegate

//已经显示了控制器
- (void)navigationController:(UINavigationController *)navigationController
       didShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animate
{
    //注意:这里当导航控制器只有一个viewcontroller的时候不能可以手势,否则奔溃
    if(self.viewControllers.count > 1) {
        if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
            self.interactivePopGestureRecognizer.enabled = YES;
    } else {
        if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
            self.interactivePopGestureRecognizer.enabled = NO;
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

二. 导航栏的barStyle 和 translucent

iOS7之后由于navigationBar.translucent默认是YES，坐标零点默认在（0，0）点  当不透明的时候，零点坐标在（0，64）；如果你想设置成透明的，而且还要零点从（0，64）开始，那就添加：self.edgesForExtendedLayout = UIRectEdgeNone;

translucent = NO, 零点从（0，64）开始, 如果想要零点从（0，0）点开始, 只需要设置: self.extendedLayoutIncludesOpaqueBars = YES;

@property(nonatomic,assign) BOOL extendedLayoutIncludesOpaqueBars NS_AVAILABLE_IOS(7_0); // Defaults to NO, but bars are translucent by default on 7_0.  

@property(nonatomic,assign) BOOL automaticallyAdjustsScrollViewInsets NS_AVAILABLE_IOS(7_0); // Defaults to YES