iOS開發——全域響應MotionEvent

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遇到這樣一個需求：應用無論處於哪個view controller，搖動手機，都能夠出發某一方法。

能夠想到的思路就是用蘋果封裝好的“MotionEvent”，但是如果簡單的把一下代碼加到某一view controller中，那麼只有在該view controller展示在前端時，搖動手機才會出發方法。

- (BOOL)canBecomeFirstResponder {//預設是NO，所以得重寫此方法，設成YES     return YES;}然後實現下列方法://很像TouchEvent事件 - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{} - (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{    NSLog(@"shake");} - (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event{}

解決方案：用Category擴充UIWindow，代碼如下：

UIWindow+.h

#import <UIKit/UIKit.h>#define UIEventSubtypeMotionShakeNotification @"UIEventSubtypeMotionShakeNotification"@interface UIWindow (Motion)// @override- (BOOL)canBecomeFirstResponder;- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event;@end

UIWindow+.m

#import "UIWindow+.h"@implementation UIWindow (Motion)- (BOOL)canBecomeFirstResponder {//預設是NO，所以得重寫此方法，設成YES     return YES;}然後實現下列方法://很像TouchEvent事件 - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{} - (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{    NSLog(@"shake");} - (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event{}@end