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| // | ||
| // QMUIWindowSizeMonitor.h | ||
| // qmuidemo | ||
| // | ||
| // Created by ziezheng on 2019/5/27. | ||
| // Copyright © 2019 QMUI Team. All rights reserved. | ||
| // | ||
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| #import <UIKit/UIkit.h> | ||
| #import <Foundation/Foundation.h> | ||
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| NS_ASSUME_NONNULL_BEGIN | ||
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| @protocol QMUIWindowSizeMonitorProtocol <NSObject> | ||
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| @optional | ||
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| /** | ||
| 当继承自 UIResponder 的对象，比如 UIView 或 UIViewController 实现了这个方法时，其所属的 window 在大小发生改变后在这个方法回调。 | ||
| @note 类似系统的 [-viewWillTransitionToSize:withTransitionCoordinator:]，但是系统这个方法回调时 window 的大小实际上还未发生改变，如果你需要在 window 大小发生之后且在 layout 之前来处理一些逻辑时，可以放到这个方法去实现。 | ||
| @param size 所属窗口的新大小 | ||
| */ | ||
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| - (void)windowDidTransitionToSize:(CGSize)size; | ||
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| @end | ||
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| typedef void (^QMUIWindowSizeObserverHandler)(CGSize newWindowSize); | ||
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| @interface NSObject (QMUIWindowSizeMonitor) | ||
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| /** | ||
| 为当前对象添加主窗口 (UIApplication Delegate Window)的大小变化的监听，同一对象可重复添加多个监听，当对象销毁时监听自动失效。 | ||
| @param handler 窗口大小发生改变时的回调 | ||
| */ | ||
| - (void)qmui_addSizeObserverForMainWindow:(QMUIWindowSizeObserverHandler)handler; | ||
| /** | ||
| 为当前对象添加指定窗口的大小变化监听，同一对象可重复添加多个监听，当对象销毁时监听自动失效。 | ||
| @param window 要监听的窗口 | ||
| @param handler 窗口大小发生改变时的回调 | ||
| */ | ||
| - (void)qmui_addSizeObserverForWindow:(UIWindow *)window handler:(QMUIWindowSizeObserverHandler)handler; | ||
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| @end | ||
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| NS_ASSUME_NONNULL_END |
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| // | ||
| // QMUIWindowSizeMonitor.m | ||
| // qmuidemo | ||
| // | ||
| // Created by ziezheng on 2019/5/27. | ||
| // Copyright © 2019 QMUI Team. All rights reserved. | ||
| // | ||
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| #import "QMUIWindowSizeMonitor.h" | ||
| #import "QMUICore.h" | ||
| #import "NSPointerArray+QMUI.h" | ||
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| @interface NSObject (QMUIWindowSizeMonitor_Private) | ||
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| @property(nonatomic, readonly) NSMutableArray <QMUIWindowSizeObserverHandler> *qwsm_windowSizeChangeHandlers; | ||
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| @end | ||
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| @interface UIResponder (QMUIWindowSizeMonitor_Private) | ||
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| @property(nonatomic, weak) UIWindow *qwsm_previousWindow; | ||
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| @end | ||
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| @interface UIWindow (QMUIWindowSizeMonitor_Private) | ||
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| @property(nonatomic, assign) CGSize qwsm_previousSzie; | ||
| @property(nonatomic, readonly) NSPointerArray *qwsm_sizeObservers; | ||
| @property(nonatomic, readonly) NSPointerArray *qwsm_canReceiveWindowDidTransitionToSizeResponders; | ||
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| - (void)qwsm_addSizeObserver:(NSObject *)observer; | ||
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| @end | ||
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| @implementation NSObject (QMUIWindowSizeMonitor) | ||
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| - (void)qmui_addSizeObserverForMainWindow:(QMUIWindowSizeObserverHandler)handler { | ||
| [self qmui_addSizeObserverForWindow:[UIApplication sharedApplication].delegate.window handler:handler]; | ||
| } | ||
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| - (void)qmui_addSizeObserverForWindow:(UIWindow *)window handler:(QMUIWindowSizeObserverHandler)handler { | ||
| NSAssert(window != nil, @"window is nil!"); | ||
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| struct Block_literal { | ||
| void *isa; | ||
| int flags; | ||
| int reserved; | ||
| void (*__FuncPtr)(void *, ...); | ||
| }; | ||
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| void * blockFuncPtr = ((__bridge struct Block_literal *)handler)->__FuncPtr; | ||
| for (QMUIWindowSizeObserverHandler handler in self.qwsm_windowSizeChangeHandlers) { | ||
| // 由于利用 block 的 __FuncPtr 指针来判断同一个实现的 block 过滤掉，防止重复添加监听 | ||
| if (((__bridge struct Block_literal *)handler)->__FuncPtr == blockFuncPtr) { | ||
| return; | ||
| } | ||
| } | ||
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| [self.qwsm_windowSizeChangeHandlers addObject:handler]; | ||
| [window qwsm_addSizeObserver:self]; | ||
| } | ||
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| - (NSMutableArray<QMUIWindowSizeObserverHandler> *)qwsm_windowSizeChangeHandlers { | ||
| NSMutableArray *_handlers = objc_getAssociatedObject(self, _cmd); | ||
| if (!_handlers) { | ||
| _handlers = [NSMutableArray array]; | ||
| objc_setAssociatedObject(self, _cmd, _handlers, OBJC_ASSOCIATION_RETAIN_NONATOMIC); | ||
| } | ||
| return _handlers; | ||
| } | ||
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| @end | ||
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| @implementation UIWindow (QMUIWindowSizeMonitor) | ||
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| QMUISynthesizeCGSizeProperty(qwsm_previousSzie, setQwsm_previousSzie) | ||
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| + (void)load { | ||
| static dispatch_once_t onceToken; | ||
| dispatch_once(&onceToken, ^{ | ||
| OverrideImplementation([UIWindow class], @selector(layoutSubviews), ^id(__unsafe_unretained Class originClass, SEL originCMD, IMP (^originalIMPProvider)(void)) { | ||
| return ^void(UIWindow *selfObject) { | ||
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| // call super | ||
| void (*originSelectorIMP)(id, SEL); | ||
| originSelectorIMP = (void (*)(id, SEL))originalIMPProvider(); | ||
| originSelectorIMP(selfObject, originCMD); | ||
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| CGSize newSize = selfObject.bounds.size; | ||
| if (!CGSizeEqualToSize(newSize, selfObject.qwsm_previousSzie)) { | ||
| if (!CGSizeEqualToSize(selfObject.qwsm_previousSzie, CGSizeZero)) { | ||
| NSLog(@"%@ :change size from %@ to %@",NSStringFromClass(selfObject.class), NSStringFromCGSize(selfObject.qwsm_previousSzie),NSStringFromCGSize(newSize)); | ||
| [selfObject qwsm_notifyObserversWithNewSize:newSize]; | ||
| } | ||
| selfObject.qwsm_previousSzie = selfObject.bounds.size; | ||
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| } | ||
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| }; | ||
| }); | ||
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| OverrideImplementation([UIView class], @selector(willMoveToWindow:), ^id(__unsafe_unretained Class originClass, SEL originCMD, IMP (^originalIMPProvider)(void)) { | ||
| return ^void(UIView *selfObject, UIWindow *newWindow) { | ||
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| // call super | ||
| void (*originSelectorIMP)(id, SEL, UIWindow *); | ||
| originSelectorIMP = (void (*)(id, SEL, UIWindow *))originalIMPProvider(); | ||
| originSelectorIMP(selfObject, originCMD, newWindow); | ||
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| if (newWindow) { | ||
| if ([selfObject respondsToSelector:@selector(windowDidTransitionToSize:)]) { | ||
| [newWindow qwsm_addDidTransitionToSizeMethodReceiver:selfObject]; | ||
| } | ||
| UIResponder *nextResponder = [selfObject nextResponder]; | ||
| if ([nextResponder isKindOfClass:[UIViewController class]] && [nextResponder respondsToSelector:@selector(windowDidTransitionToSize:)]) { | ||
| [newWindow qwsm_addDidTransitionToSizeMethodReceiver:nextResponder]; | ||
| } | ||
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| } | ||
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| }; | ||
| }); | ||
| }); | ||
| } | ||
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| - (void)qwsm_notifyObserversWithNewSize:(CGSize)newSize { | ||
| for (NSUInteger i = 0, count = self.qwsm_sizeObservers.count; i < count; i++) { | ||
| NSObject *object = [self.qwsm_sizeObservers pointerAtIndex:i]; | ||
| for (NSUInteger i = 0, count = object.qwsm_windowSizeChangeHandlers.count; i < count; i++) { | ||
| QMUIWindowSizeObserverHandler handler = object.qwsm_windowSizeChangeHandlers[i]; | ||
| handler(newSize); | ||
| } | ||
| } | ||
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| for (NSUInteger i = 0, count = self.qwsm_canReceiveWindowDidTransitionToSizeResponders.count; i < count; i++) { | ||
| UIResponder <QMUIWindowSizeMonitorProtocol>*responder = [self.qwsm_canReceiveWindowDidTransitionToSizeResponders pointerAtIndex:i]; | ||
| [responder windowDidTransitionToSize:self.bounds.size]; | ||
| } | ||
| } | ||
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| - (void)qwsm_removeSizeObserver:(NSObject *)observer { | ||
| NSUInteger index = [self.qwsm_sizeObservers qmui_indexOfPointer:(__bridge void *)observer]; | ||
| if (index != NSNotFound) { | ||
| [self.qwsm_sizeObservers removePointerAtIndex:index]; | ||
| } | ||
| } | ||
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| - (void)qwsm_addDidTransitionToSizeMethodReceiver:(UIResponder *)receiver { | ||
| if ([self.qwsm_canReceiveWindowDidTransitionToSizeResponders qmui_containsPointer:(__bridge void *)(receiver)]) return; | ||
| if (receiver.qwsm_previousWindow && receiver.qwsm_previousWindow != self) { | ||
| [receiver.qwsm_previousWindow qwsm_removeSizeObserver:receiver]; | ||
| } | ||
| receiver.qwsm_previousWindow = self; | ||
| [self.qwsm_canReceiveWindowDidTransitionToSizeResponders addPointer:(__bridge void *)(receiver)]; | ||
| } | ||
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| - (void)qwsm_addSizeObserver:(NSObject *)observer { | ||
| if ([self.qwsm_sizeObservers qmui_containsPointer:(__bridge void *)(observer)]) return; | ||
| [self.qwsm_sizeObservers addPointer:(__bridge void *)(observer)]; | ||
| } | ||
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| - (NSPointerArray *)qwsm_sizeObservers { | ||
| NSPointerArray *qwsm_sizeObservers = objc_getAssociatedObject(self, _cmd); | ||
| if (!qwsm_sizeObservers) { | ||
| qwsm_sizeObservers = [NSPointerArray weakObjectsPointerArray]; | ||
| objc_setAssociatedObject(self, _cmd, qwsm_sizeObservers, OBJC_ASSOCIATION_RETAIN_NONATOMIC); | ||
| } | ||
| return qwsm_sizeObservers; | ||
| } | ||
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| - (NSPointerArray *)qwsm_canReceiveWindowDidTransitionToSizeResponders { | ||
| NSPointerArray *qwsm_responders = objc_getAssociatedObject(self, _cmd); | ||
| if (!qwsm_responders) { | ||
| qwsm_responders = [NSPointerArray weakObjectsPointerArray]; | ||
| objc_setAssociatedObject(self, _cmd, qwsm_responders, OBJC_ASSOCIATION_RETAIN_NONATOMIC); | ||
| } | ||
| return qwsm_responders; | ||
| } | ||
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| @end | ||
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| @implementation UIResponder (QMUIWindowSizeMonitor) | ||
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| QMUISynthesizeIdWeakProperty(qwsm_previousWindow, setQwsm_previousWindow) | ||
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| @end |
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