需求前提

1. app内轻量级的视频播放功能,故不希望引入“过度开发、过度封装”的第三方控件组,使用原生的AVPlayerViewController

2. 工具栏有新增控件需求,如下载按钮 等

3. 希望自定义的控件组可以伴随 系统原生控件组一起出现或隐藏

需要的第三方库

aop框架组

pod 'Aspects'

实施步骤

1.新增两个属性,记录要操作的view和HOOK的对象信息

//记录音量控制的父控件,控制它隐藏显示的 view
@property (nonatomic, weak)UIView *volumeSuperView;
//记录我们 hook 的对象信息
@property (nonatomic, strong)id<AspectToken>hookAVPlaySingleTap;

2.在视频播放器响应手势事件时进行HOOK

Class UIGestureRecognizerTarget = NSClassFromString(@"UIGestureRecognizerTarget");
_hookAVPlaySingleTap = [UIGestureRecognizerTarget aspect_hookSelector:@selector(_sendActionWithGestureRecognizer:) withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo>info,UIGestureRecognizer *gest){
if (gest.numberOfTouches == ) {
//AVVolumeButtonControl
if (!self.volumeSuperView) {
UIView *view = [gest.view findViewByClassName:@"AVVolumeButtonControl"];
if (view) {
while (view.superview) {
view = view.superview;
if ([view isKindOfClass:[NSClassFromString(@"AVTouchIgnoringView") class]]) {
self.volumeSuperView = view;
[view HF_addObserverForKeyPath:@"hidden" block:^(__weak id object, id oldValue, id newValue) {
NSLog(@"newValue ==%@",newValue);
BOOL isHidden = [(NSNumber *)newValue boolValue];
dispatch_async(dispatch_get_main_queue(), ^{
//做同步显隐操作 }); }];
break;
}
}
}
}
} } error:nil];

3. 出控制器时,应移除HOOK

- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[self.hookAVPlaySingleTap remove];
}

部分category工具方法代码

- (UIView *)findViewByClassName:(NSString *)className
{
UIView *view;
if ([NSStringFromClass(self.class) isEqualToString:className]) {
return self;
} else {
for (UIView *child in self.subviews) {
view = [child findViewByClassName:className];
if (view != nil) break;
}
}
return view;
}
#import "NSObject+BlockObserver.h"
#import <objc/message.h> @interface HFDefaultObserver : NSObject
@property (nonatomic, copy) HFKVOblock kvoBlock;
@property (nonatomic, copy) HFNotificationBlock notificationBlock; @end @implementation HFDefaultObserver
- (instancetype)initWithKVOBlock:(HFKVOblock)kvoBlock
{
if (self = [super init]) {
_kvoBlock = kvoBlock;
}
return self;
} - (instancetype)initWithNotificationBlock:(HFNotificationBlock)notificationBlock
{
if (self = [super init]) {
_notificationBlock = notificationBlock;
}
return self;
} //实现监听方法
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context
{
if (!self.kvoBlock) {
return;
}
BOOL isPrior = [[change objectForKey:NSKeyValueChangeNotificationIsPriorKey] boolValue];
if (isPrior) {
return;
} NSKeyValueChange changeKind = [[change objectForKey:NSKeyValueChangeKindKey] integerValue];
if (changeKind != NSKeyValueChangeSetting) {
return;
}
id oldValue = [change objectForKey:NSKeyValueChangeOldKey];
if (oldValue == [NSNull null]) {
oldValue = nil;
}
id newValue = [change objectForKey:NSKeyValueChangeNewKey];
if (newValue == [NSNull null]) {
newValue = nil;
}
if (oldValue != newValue) {
self.kvoBlock(object, oldValue, newValue);
}
} - (void)handleNotification:(NSNotification *)notification
{
!self.notificationBlock ?: self.notificationBlock(notification);
} @end @implementation NSObject (BlockObserver) static NSString * const KHFObserverKey = @"KHFObserverKey";
static NSString * const KHFNotificationObserversKey = @"KHFNotificationObserversKey"; // 替换dealloc方法,自动注销observer
+ (void)load
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Method originalDealloc = class_getInstanceMethod(self, NSSelectorFromString(@"dealloc"));
Method newDealloc = class_getInstanceMethod(self, @selector(autoRemoveObserverDealloc));
method_exchangeImplementations(originalDealloc, newDealloc);
});
} - (void)autoRemoveObserverDealloc
{
if (objc_getAssociatedObject(self, (__bridge const void *)KHFObserverKey) || objc_getAssociatedObject(self, (__bridge const void *)KHFNotificationObserversKey)) {
[self HF_removeAllObserverBlocks];
[self HF_removeAllNotificationBlocks];
}
//这句相当于直接调用dealloc
[self autoRemoveObserverDealloc];
} - (void)HF_addObserverForKeyPath:(NSString *)keyPath block:(HFKVOblock)block
{
if (keyPath.length == || !block) {
return;
}
NSMutableDictionary *observersDict = objc_getAssociatedObject(self, (__bridge const void *)KHFObserverKey);
if (!observersDict) {
observersDict = [NSMutableDictionary dictionary];
objc_setAssociatedObject(self, (__bridge const void *)KHFObserverKey, observersDict, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
NSMutableArray * observers = [observersDict objectForKey:keyPath];
if (!observers) {
observers = [NSMutableArray array];
[observersDict setObject:observers forKey:keyPath];
}
HFDefaultObserver *observer = [[HFDefaultObserver alloc] initWithKVOBlock:block];
[self addObserver:observer forKeyPath:keyPath options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:NULL];
[observers addObject:observer];
} - (void)HF_removeObserverBlocksForKeyPath:(NSString *)keyPath
{
if (keyPath.length == ) {
return;
}
NSMutableDictionary *observersDict = objc_getAssociatedObject(self, (__bridge const void *)KHFObserverKey);
if (observersDict) {
NSMutableArray *observers = [observersDict objectForKey:keyPath];
[observers enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[self removeObserver:obj forKeyPath:keyPath];
}];
[observersDict removeObjectForKey:keyPath];
}
} - (void)HF_removeAllObserverBlocks
{
NSMutableDictionary *observersDict = objc_getAssociatedObject(self, (__bridge const void *)KHFObserverKey);
if (observersDict) { [observersDict enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSMutableArray *obsevers, BOOL * _Nonnull stop) {
[obsevers enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[self removeObserver:obj forKeyPath:key];
}];
}];
[observersDict removeAllObjects];
}
} - (void)HF_addNotificationForName:(NSString *)name block:(HFNotificationBlock)block
{
if (name.length == || !block) {
return;
}
NSMutableDictionary *observersDict = objc_getAssociatedObject(self, (__bridge const void *)KHFNotificationObserversKey);
if (!observersDict) {
observersDict = [NSMutableDictionary dictionary];
objc_setAssociatedObject(self, (__bridge const void *)KHFNotificationObserversKey, observersDict, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
NSMutableArray *observers = [observersDict objectForKey:name];
if (!observers) {
observers = [NSMutableArray array];
[observersDict setObject:observers forKey:name];
}
HFDefaultObserver *observer = [[HFDefaultObserver alloc] initWithNotificationBlock:block];
[[NSNotificationCenter defaultCenter] addObserver:observer selector:@selector(handleNotification:) name:name object:nil];
[observers addObject:observer]; } - (void)HF_removeNotificationBlocksForName:(NSString *)name
{
if (name.length == ) {
return;
}
NSMutableDictionary *observersDict = objc_getAssociatedObject(self, (__bridge const void *)KHFNotificationObserversKey);
if (observersDict) {
NSMutableArray *observers = [observersDict objectForKey:name];
[observers enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[[NSNotificationCenter defaultCenter] removeObserver:obj name:name object:nil];
}];
[observersDict removeObjectForKey:name];
} } - (void)HF_removeAllNotificationBlocks
{
NSMutableDictionary *observersDict = objc_getAssociatedObject(self, (__bridge const void *)KHFNotificationObserversKey);
[observersDict enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSMutableArray *observers, BOOL * _Nonnull stop) {
[observers enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[[NSNotificationCenter defaultCenter] removeObserver:obj name:key object:nil];
}];
}];
[observersDict removeAllObjects];
} @end
#import <Foundation/Foundation.h>

typedef void(^HFKVOblock)(__weak id object, id oldValue, id newValue);
typedef void(^HFNotificationBlock)(NSNotification *notification);
@interface NSObject (BlockObserver) - (void)HF_addObserverForKeyPath:(NSString *)keyPath block:(HFKVOblock)block;
- (void)HF_removeObserverBlocksForKeyPath:(NSString *)keyPath;
- (void)HF_removeAllObserverBlocks; - (void)HF_addNotificationForName:(NSString *)name block:(HFNotificationBlock)block;
- (void)HF_removeNotificationBlocksForName:(NSString *)name;
- (void)HF_removeAllNotificationBlocks;

@end

参考文档

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