https://www.jianshu.com/p/29e456ffa831
先貼上大神的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
不得不說這真的是一個很牛逼的庫。
首先這是一個對全局都能起作用的庫，他有一些默認的操作。意思就是說你只要導入了就能夠起作用。
默認起的作用就是全屏的返回手勢
說真的，賊好用，對於大冬天不願意拿出2只手但是屏幕又大的同學，真的是交互上的絕對性勝利。而且這個實現簡直真的可以像大神說的 絲滑來形容。緣 妙不可言
導航欄的改變
以 A push B 作介紹
想要控制導航欄的顯示或者隱藏，Apple對導航欄的API設計上總是不盡人意。
唉，UINavigationController和UIViewController總是2個不相同的控制器，並且他們的關系其實並沒有達到誰控制誰。
如果需求是需要Apush后將B隱藏，我們在設置的時候一般會
-
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、
//要設置代理UINavigationControllerDelegate
// 將要顯示控制器
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
// 判斷要顯示的控制器是否是自己
BOOL isShowHomePage = [viewController isKindOfClass:[self class]];
[self.navigationController setNavigationBarHidden:isShowHomePage animated:YES];
}
但是如果碰到喪心病狂的老板，他不要A也不要B，但是就要Push。
如果還按照以上寫法，在用手勢返回或者pop返回的時候，A界面會viewWillAppear執行。導致在滑動的過程中我們可以看到A界面導航欄的存在。這對強迫症來說完全不能忍，這時候FDFullscreenPopGesture就完全的解決了我們的問題。重要的是代碼非常簡潔，一句話。在所需要隱藏導航欄的界面寫上
- (void)viewDidLoad
[super viewDidLoad];
self.navigationController.fd_prefersNavigationBarHidden = YES;
}
或者喜歡重載的寫法也行：
- (BOOL)fd_prefersNavigationBarHidden {
return YES;
}
解決FDFullscreenPopGesture連續多個頁面隱藏導航欄的BUG
下面的方法可以用FDFullscreenPopGesture實現相鄰頁面的導航欄任意交替隱藏和顯示(主要解決連續多個頁面隱藏導航欄出現的BUG)
實現方法：
- 在所有需要隱藏導航欄的頁面加上如下代碼
@property (nonatomic, assign) BOOL previousNaviBarShow; #import "UINavigationController+FDFullscreenPopGesture.h" - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; // 在所有需要隱藏導航欄的頁面加上這兩行代碼，所有需要顯示導航欄的頁面不做任何操作即可 self.fd_prefersNavigationBarHidden = YES; [self.navigationController setNavigationBarHidden:YES animated:self.previousNaviBarShow]; } - 在所有 由(顯示導航欄頁面)推出(隱藏導航欄頁面)的地方，把要推出頁面的
previousNaviBarShow置為YES
多個界面交替隱藏導航欄的 demo地址
注意，寫了fd_prefersNavigationBarHidden就不能再去寫關於viewWillAppear/viewWillDisappear/等一系列廢操作了。因為這一句話已經囊括隱藏導航欄的代碼了
使用FDFullscreenPopGesture遇到的坑以及解決方法
https://www.jianshu.com/p/bbc2305d83e2
最近需要給APP添加手勢左滑返回功能，使用了框架FDFullscreenPopGesture，把使用過程中遇到的坑以及解決方法記錄下
2018-05-03 更新------
當使用相機進行拍攝的時候，頁面的上方看不見了，閃光燈功能使用不了，所以添加了如下判斷：
// 設置導航的顯示/隱藏
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(CGFLOAT_MIN * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
UIViewController *vc = [self.navigationController.viewControllers lastObject];
// 添加對相機拍攝的過濾
if ([self.navigationController isKindOfClass:[UIImagePickerController class]]
) {
UIImagePickerController *imagePickVC = (UIImagePickerController *)self.navigationController;
// 不是相機才進行處理
if (imagePickVC.sourceType != UIImagePickerControllerSourceTypeCamera) {
[self _handleVCNavigationBarHidden:vc];
}
} else {
// 不是相機才進行處理
[self _handleVCNavigationBarHidden:vc];
}
});
- (void)_handleVCNavigationBarHidden:(UIViewController *)vc {
[self.navigationController setNavigationBarHidden:vc.fd_prefersNavigationBarHidden animated:NO];
}
一、UIWebView無法左滑返回
原因：UIWebView默認是不開啟左滑手勢返回功能的，需要自己開啟；
解決：在viewDidLoad方法里面設置屬性fd_interactivePopDisabled為NO;
- (void)viewDidLoad
{
[super viewDidLoad];
self.fd_interactivePopDisabled = NO;
}
二、UIWebView左滑返回沒有成功時或者取消返回時導航欄的title文字為空，不見了
原因：在viewWillDisappear:方法里面UIWebView控件被銷毀了；
ScanWebView = nil;
解決：
方法一： 最直接有效
在viewWillDisappear:方法里面取消UIWebView控件的銷毀；即把這行代碼注釋掉；ScanWebView = nil;//注釋掉
方法二： 比較復雜
在webViewDidFinishLoad:方法里面用一個變量保存獲取的title文字，在viewWillAppear:方法里面設置導航欄的title文字；
1、保存title文字的變量
@property (nonatomic, copy) NSString *titleString; //保存title文字的變量
2、設置導航欄的title文字
- (void)viewWillAppear:(BOOL)animated{ //設置導航欄的title文字
[super viewWillAppear:animated];
self.titleLabel.text = self.titleString;
}
3、用變量保存獲取到的title文字
- (void)webViewDidFinishLoad:(UIWebView *)webView{ //用變量保存獲取到的title文字
NSString *title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];
self.titleString = title;
}
三、左滑返回沒有成功或者取消時，會出現 ... 的情況
原因：導航控制器的導航欄默認是有一個返回按鈕的；設置屬性hidesBackButton為YES就會出現這種情況；
解決：設置屬性hidesBackButton為NO，或者直接注釋掉這行代碼，不進行設置；
self.navigationItem.hidesBackButton = NO;
四、從無NavigationBar到有NavigationBar，手勢返回的時候，有NavigationBar的控制器導航欄會變成白色，或者消失不見了；
原因：在滑動的時候顯示出錯
解決：
在viewWillAppear:和viewWillDisappear:方法里面添加對是否隱藏NavigationBar的判斷；
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、調用系統的發送短信控制器MFMessageComposeViewController時（如使用shareSDK進行短信分享時），右上角沒有“取消按鈕”，無法返回app
原因：好像被擋住了
解決：添加對控制器是否是MFMessageComposeViewController的判斷，是的話添加自己添加一個取消按鈕並添加方法的實現，
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];
}
以上為使用過程遇到的坑以及解決辦法，很多也都是從GitHub搜集而來的，建議多到GitHub去看看；
附上FDFullscreenPopGesture的GitHub鏈接；https://github.com/forkingdog/FDFullscreenPopGesture
最后貼上在FDFullscreenPopGesture基礎上修改后的代碼：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);
}
//設置導航的顯示/隱藏
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];
//設置導航的顯示/隱藏
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];
//過濾MessageUI，並且添加取消按鈕
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
最后貼上改善后的GitHub地址 https://github.com/1570383140/FDFullscreenPopGesture.git
作者：zhhelnice
來源：CSDN
原文：https://blog.csdn.net/zhhelnice/article/details/60580637
作者：oceanfive
鏈接：https://www.jianshu.com/p/bbc2305d83e2
來源：簡書
簡書著作權歸作者所有，任何形式的轉載都請聯系作者獲得授權並注明出處。