https://www.jianshu.com/p/29e456ffa831
先贴上大神的blog 以示敬意 http://blog.sunnyxx.com/2015/06/07/fullscreen-pop-gesture/
改善后的demo地址 https://github.com/1570383140/FDFullscreenPopGesture
不得不说这真的是一个很牛逼的库。
首先这是一个对全局都能起作用的库，他有一些默认的操作。意思就是说你只要导入了就能够起作用。
默认起的作用就是全屏的返回手势
说真的，贼好用，对于大冬天不愿意拿出2只手但是屏幕又大的同学，真的是交互上的绝对性胜利。而且这个实现简直真的可以像大神说的 丝滑来形容。缘 妙不可言
导航栏的改变
以 A push B 作介绍
想要控制导航栏的显示或者隐藏，Apple对导航栏的API设计上总是不尽人意。
唉，UINavigationController和UIViewController总是2个不相同的控制器，并且他们的关系其实并没有达到谁控制谁。
如果需求是需要Apush后将B隐藏，我们在设置的时候一般会
-
1、
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
或者2、
//要设置代理UINavigationControllerDelegate
// 将要显示控制器
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
// 判断要显示的控制器是否是自己
BOOL isShowHomePage = [viewController isKindOfClass:[self class]];
[self.navigationController setNavigationBarHidden:isShowHomePage animated:YES];
}
但是如果碰到丧心病狂的老板，他不要A也不要B，但是就要Push。
如果还按照以上写法，在用手势返回或者pop返回的时候，A界面会viewWillAppear执行。导致在滑动的过程中我们可以看到A界面导航栏的存在。这对强迫症来说完全不能忍，这时候FDFullscreenPopGesture就完全的解决了我们的问题。重要的是代码非常简洁，一句话。在所需要隐藏导航栏的界面写上
- (void)viewDidLoad
[super viewDidLoad];
self.navigationController.fd_prefersNavigationBarHidden = YES;
}
或者喜欢重载的写法也行：
- (BOOL)fd_prefersNavigationBarHidden {
return YES;
}
解决FDFullscreenPopGesture连续多个页面隐藏导航栏的BUG
下面的方法可以用FDFullscreenPopGesture实现相邻页面的导航栏任意交替隐藏和显示(主要解决连续多个页面隐藏导航栏出现的BUG)
实现方法：
- 在所有需要隐藏导航栏的页面加上如下代码
@property (nonatomic, assign) BOOL previousNaviBarShow; #import "UINavigationController+FDFullscreenPopGesture.h" - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; // 在所有需要隐藏导航栏的页面加上这两行代码，所有需要显示导航栏的页面不做任何操作即可 self.fd_prefersNavigationBarHidden = YES; [self.navigationController setNavigationBarHidden:YES animated:self.previousNaviBarShow]; } - 在所有 由(显示导航栏页面)推出(隐藏导航栏页面)的地方，把要推出页面的
previousNaviBarShow置为YES
多个界面交替隐藏导航栏的 demo地址
注意，写了fd_prefersNavigationBarHidden就不能再去写关于viewWillAppear/viewWillDisappear/等一系列废操作了。因为这一句话已经囊括隐藏导航栏的代码了
使用FDFullscreenPopGesture遇到的坑以及解决方法
https://www.jianshu.com/p/bbc2305d83e2
最近需要给APP添加手势左滑返回功能，使用了框架FDFullscreenPopGesture，把使用过程中遇到的坑以及解决方法记录下
2018-05-03 更新------
当使用相机进行拍摄的时候，页面的上方看不见了，闪光灯功能使用不了，所以添加了如下判断：
// 设置导航的显示/隐藏
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(CGFLOAT_MIN * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
UIViewController *vc = [self.navigationController.viewControllers lastObject];
// 添加对相机拍摄的过滤
if ([self.navigationController isKindOfClass:[UIImagePickerController class]]
) {
UIImagePickerController *imagePickVC = (UIImagePickerController *)self.navigationController;
// 不是相机才进行处理
if (imagePickVC.sourceType != UIImagePickerControllerSourceTypeCamera) {
[self _handleVCNavigationBarHidden:vc];
}
} else {
// 不是相机才进行处理
[self _handleVCNavigationBarHidden:vc];
}
});
- (void)_handleVCNavigationBarHidden:(UIViewController *)vc {
[self.navigationController setNavigationBarHidden:vc.fd_prefersNavigationBarHidden animated:NO];
}
一、UIWebView无法左滑返回
原因：UIWebView默认是不开启左滑手势返回功能的，需要自己开启；
解决：在viewDidLoad方法里面设置属性fd_interactivePopDisabled为NO;
- (void)viewDidLoad
{
[super viewDidLoad];
self.fd_interactivePopDisabled = NO;
}
二、UIWebView左滑返回没有成功时或者取消返回时导航栏的title文字为空，不见了
原因：在viewWillDisappear:方法里面UIWebView控件被销毁了；
ScanWebView = nil;
解决：
方法一： 最直接有效
在viewWillDisappear:方法里面取消UIWebView控件的销毁；即把这行代码注释掉；ScanWebView = nil;//注释掉
方法二： 比较复杂
在webViewDidFinishLoad:方法里面用一个变量保存获取的title文字，在viewWillAppear:方法里面设置导航栏的title文字；
1、保存title文字的变量
@property (nonatomic, copy) NSString *titleString; //保存title文字的变量
2、设置导航栏的title文字
- (void)viewWillAppear:(BOOL)animated{ //设置导航栏的title文字
[super viewWillAppear:animated];
self.titleLabel.text = self.titleString;
}
3、用变量保存获取到的title文字
- (void)webViewDidFinishLoad:(UIWebView *)webView{ //用变量保存获取到的title文字
NSString *title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];
self.titleString = title;
}
三、左滑返回没有成功或者取消时，会出现 ... 的情况
原因：导航控制器的导航栏默认是有一个返回按钮的；设置属性hidesBackButton为YES就会出现这种情况；
解决：设置属性hidesBackButton为NO，或者直接注释掉这行代码，不进行设置；
self.navigationItem.hidesBackButton = NO;
四、从无NavigationBar到有NavigationBar，手势返回的时候，有NavigationBar的控制器导航栏会变成白色，或者消失不见了；
原因：在滑动的时候显示出错
解决：
在viewWillAppear:和viewWillDisappear:方法里面添加对是否隐藏NavigationBar的判断；
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(CGFLOAT_MIN * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
UIViewController *vc = [self.navigationController.viewControllers lastObject];
if (vc.fd_prefersNavigationBarHidden) {
[self.navigationController setNavigationBarHidden:YES animated:NO];
} else {
[self.navigationController setNavigationBarHidden:NO animated:NO];
}
});
五、调用系统的发送短信控制器MFMessageComposeViewController时（如使用shareSDK进行短信分享时），右上角没有“取消按钮”，无法返回app
原因：好像被挡住了
解决：添加对控制器是否是MFMessageComposeViewController的判断，是的话添加自己添加一个取消按钮并添加方法的实现，
if ([self isKindOfClass:[MFMessageComposeViewController class]]) {
[self fd_pushViewController:viewController animated:animated];
[[self.viewControllers lastObject] navigationItem].rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(dismissModal:)];
return;
}
- (void)dismissModal:(UIButton *)sender{
[[self.viewControllers lastObject] dismissViewControllerAnimated:YES completion:nil];
}
以上为使用过程遇到的坑以及解决办法，很多也都是从GitHub搜集而来的，建议多到GitHub去看看；
附上FDFullscreenPopGesture的GitHub链接；https://github.com/forkingdog/FDFullscreenPopGesture
最后贴上在FDFullscreenPopGesture基础上修改后的代码：xx
// The MIT License (MIT)
//
// Copyright (c) 2015-2016 forkingdog ( https://github.com/forkingdog )
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#import "UINavigationController+FDFullscreenPopGesture.h"
#import <objc/runtime.h>
#import <MessageUI/MessageUI.h>
@interface _FDFullscreenPopGestureRecognizerDelegate : NSObject <UIGestureRecognizerDelegate>
@property (nonatomic, weak) UINavigationController *navigationController;
@end
@implementation _FDFullscreenPopGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)gestureRecognizer
{
// Ignore when no view controller is pushed into the navigation stack.
if (self.navigationController.viewControllers.count <= 1) {
return NO;
}
// Ignore when the active view controller doesn't allow interactive pop.
UIViewController *topViewController = self.navigationController.viewControllers.lastObject;
if (topViewController.fd_interactivePopDisabled) {
return NO;
}
// Ignore when the beginning location is beyond max allowed initial distance to left edge.
CGPoint beginningLocation = [gestureRecognizer locationInView:gestureRecognizer.view];
CGFloat maxAllowedInitialDistance = topViewController.fd_interactivePopMaxAllowedInitialDistanceToLeftEdge;
if (maxAllowedInitialDistance > 0 && beginningLocation.x > maxAllowedInitialDistance) {
return NO;
}
// Ignore pan gesture when the navigation controller is currently in transition.
if ([[self.navigationController valueForKey:@"_isTransitioning"] boolValue]) {
return NO;
}
// Prevent calling the handler when the gesture begins in an opposite direction.
CGPoint translation = [gestureRecognizer translationInView:gestureRecognizer.view];
if (translation.x <= 0) {
return NO;
}
return YES;
}
@end
typedef void (^_FDViewControllerWillAppearInjectBlock)(UIViewController *viewController, BOOL animated);
@interface UIViewController (FDFullscreenPopGesturePrivate)
@property (nonatomic, copy) _FDViewControllerWillAppearInjectBlock fd_willAppearInjectBlock;
@end
@implementation UIViewController (FDFullscreenPopGesturePrivate)
+ (void)load
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Class class = [self class];
//viewWillAppear
SEL originalSelector = @selector(viewWillAppear:);
SEL swizzledSelector = @selector(fd_viewWillAppear:);
Method originalMethod = class_getInstanceMethod(class, originalSelector);
Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
BOOL success = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));
if (success) {
class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
//viewWillDisappear
SEL originalSelector2 = @selector(viewWillDisappear:);
SEL swizzledSelector2 = @selector(fd_viewWillDisappear:);
Method originalMethod2 = class_getInstanceMethod(class, originalSelector2);
Method swizzledMethod2 = class_getInstanceMethod(class, swizzledSelector2);
BOOL success2 = class_addMethod(class, originalSelector2, method_getImplementation(swizzledMethod2), method_getTypeEncoding(swizzledMethod2));
if (success2) {
class_replaceMethod(class, swizzledSelector2, method_getImplementation(originalMethod2), method_getTypeEncoding(originalMethod2));
} else {
method_exchangeImplementations(originalMethod2, swizzledMethod2);
}
});
}
- (void)fd_viewWillAppear:(BOOL)animated
{
// Forward to primary implementation.
[self fd_viewWillAppear:animated];
if (self.fd_willAppearInjectBlock) {
self.fd_willAppearInjectBlock(self, animated);
}
//设置导航的显示/隐藏
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(CGFLOAT_MIN * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
UIViewController *vc = [self.navigationController.viewControllers lastObject];
if (vc.fd_prefersNavigationBarHidden) {
[self.navigationController setNavigationBarHidden:YES animated:NO];
} else {
[self.navigationController setNavigationBarHidden:NO animated:NO];
}
});
}
- (void)fd_viewWillDisappear:(BOOL)animated{
[self fd_viewWillDisappear:animated];
//设置导航的显示/隐藏
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(CGFLOAT_MIN * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
UIViewController *vc = [self.navigationController.viewControllers lastObject];
if (vc.fd_prefersNavigationBarHidden) {
[self.navigationController setNavigationBarHidden:YES animated:NO];
} else {
[self.navigationController setNavigationBarHidden:NO animated:NO];
}
});
}
- (_FDViewControllerWillAppearInjectBlock)fd_willAppearInjectBlock
{
return objc_getAssociatedObject(self, _cmd);
}
- (void)setFd_willAppearInjectBlock:(_FDViewControllerWillAppearInjectBlock)block
{
objc_setAssociatedObject(self, @selector(fd_willAppearInjectBlock), block, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
@end
@implementation UINavigationController (FDFullscreenPopGesture)
+ (void)load
{
// Inject "-pushViewController:animated:"
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Class class = [self class];
SEL originalSelector = @selector(pushViewController:animated:);
SEL swizzledSelector = @selector(fd_pushViewController:animated:);
Method originalMethod = class_getInstanceMethod(class, originalSelector);
Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
BOOL success = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));
if (success) {
class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
});
}
- (void)fd_pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (![self.interactivePopGestureRecognizer.view.gestureRecognizers containsObject:self.fd_fullscreenPopGestureRecognizer]) {
// Add our own gesture recognizer to where the onboard screen edge pan gesture recognizer is attached to.
[self.interactivePopGestureRecognizer.view addGestureRecognizer:self.fd_fullscreenPopGestureRecognizer];
// Forward the gesture events to the private handler of the onboard gesture recognizer.
NSArray *internalTargets = [self.interactivePopGestureRecognizer valueForKey:@"targets"];
id internalTarget = [internalTargets.firstObject valueForKey:@"target"];
SEL internalAction = NSSelectorFromString(@"handleNavigationTransition:");
self.fd_fullscreenPopGestureRecognizer.delegate = self.fd_popGestureRecognizerDelegate;
[self.fd_fullscreenPopGestureRecognizer addTarget:internalTarget action:internalAction];
// Disable the onboard gesture recognizer.
self.interactivePopGestureRecognizer.enabled = NO;
}
// Handle perferred navigation bar appearance.
[self fd_setupViewControllerBasedNavigationBarAppearanceIfNeeded:viewController];
//过滤MessageUI，并且添加取消按钮
if ([self isKindOfClass:[MFMessageComposeViewController class]]) {
[self fd_pushViewController:viewController animated:animated];
[[self.viewControllers lastObject] navigationItem].rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(dismissModal:)];
return;
}
// Forward to primary implementation.
if (![self.viewControllers containsObject:viewController]) {
[self fd_pushViewController:viewController animated:animated];
}
}
- (void)dismissModal:(UIButton *)sender
{
[[self.viewControllers lastObject] dismissViewControllerAnimated:YES completion:nil];
}
- (void)fd_setupViewControllerBasedNavigationBarAppearanceIfNeeded:(UIViewController *)appearingViewController
{
if (!self.fd_viewControllerBasedNavigationBarAppearanceEnabled) {
return;
}
__weak typeof(self) weakSelf = self;
_FDViewControllerWillAppearInjectBlock block = ^(UIViewController *viewController, BOOL animated) {
__strong typeof(weakSelf) strongSelf = weakSelf;
if (strongSelf) {
[strongSelf setNavigationBarHidden:viewController.fd_prefersNavigationBarHidden animated:animated];
}
};
// Setup will appear inject block to appearing view controller.
// Setup disappearing view controller as well, because not every view controller is added into
// stack by pushing, maybe by "-setViewControllers:".
appearingViewController.fd_willAppearInjectBlock = block;
UIViewController *disappearingViewController = self.viewControllers.lastObject;
if (disappearingViewController && !disappearingViewController.fd_willAppearInjectBlock) {
disappearingViewController.fd_willAppearInjectBlock = block;
}
}
- (_FDFullscreenPopGestureRecognizerDelegate *)fd_popGestureRecognizerDelegate
{
_FDFullscreenPopGestureRecognizerDelegate *delegate = objc_getAssociatedObject(self, _cmd);
if (!delegate) {
delegate = [[_FDFullscreenPopGestureRecognizerDelegate alloc] init];
delegate.navigationController = self;
objc_setAssociatedObject(self, _cmd, delegate, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
return delegate;
}
- (UIPanGestureRecognizer *)fd_fullscreenPopGestureRecognizer
{
UIPanGestureRecognizer *panGestureRecognizer = objc_getAssociatedObject(self, _cmd);
if (!panGestureRecognizer) {
panGestureRecognizer = [[UIPanGestureRecognizer alloc] init];
panGestureRecognizer.maximumNumberOfTouches = 1;
objc_setAssociatedObject(self, _cmd, panGestureRecognizer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
return panGestureRecognizer;
}
- (BOOL)fd_viewControllerBasedNavigationBarAppearanceEnabled
{
NSNumber *number = objc_getAssociatedObject(self, _cmd);
if (number) {
return number.boolValue;
}
self.fd_viewControllerBasedNavigationBarAppearanceEnabled = YES;
return YES;
}
- (void)setFd_viewControllerBasedNavigationBarAppearanceEnabled:(BOOL)enabled
{
SEL key = @selector(fd_viewControllerBasedNavigationBarAppearanceEnabled);
objc_setAssociatedObject(self, key, @(enabled), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end
@implementation UIViewController (FDFullscreenPopGesture)
- (BOOL)fd_interactivePopDisabled
{
return [objc_getAssociatedObject(self, _cmd) boolValue];
}
- (void)setFd_interactivePopDisabled:(BOOL)disabled
{
objc_setAssociatedObject(self, @selector(fd_interactivePopDisabled), @(disabled), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL)fd_prefersNavigationBarHidden
{
return [objc_getAssociatedObject(self, _cmd) boolValue];
}
- (void)setFd_prefersNavigationBarHidden:(BOOL)hidden
{
objc_setAssociatedObject(self, @selector(fd_prefersNavigationBarHidden), @(hidden), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (CGFloat)fd_interactivePopMaxAllowedInitialDistanceToLeftEdge
{
#if CGFLOAT_IS_DOUBLE
return [objc_getAssociatedObject(self, _cmd) doubleValue];
#else
return [objc_getAssociatedObject(self, _cmd) floatValue];
#endif
}
- (void)setFd_interactivePopMaxAllowedInitialDistanceToLeftEdge:(CGFloat)distance
{
SEL key = @selector(fd_interactivePopMaxAllowedInitialDistanceToLeftEdge);
objc_setAssociatedObject(self, key, @(MAX(0, distance)), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end
最后贴上改善后的GitHub地址 https://github.com/1570383140/FDFullscreenPopGesture.git
作者：zhhelnice
来源：CSDN
原文：https://blog.csdn.net/zhhelnice/article/details/60580637
作者：oceanfive
链接：https://www.jianshu.com/p/bbc2305d83e2
来源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。