runtime应用一例

Posted 2022-12-11 WoodBear009

看到有人在论坛问：自己的应用已经开发完了，老板突然说想让应用中的button点击时要带震动效果。

手机震动直接调用 AudioservicesPlaySystemSound(kSystemSoundID_Vibrate);即可

但是如果要把这句话一个一个的加到所有but的点击回调方法里，未免工作量太“大”了，而且也比较“笨”，我想了想，觉得利用runtime机制，可以比较好的解决这个问题

首先要了解，UIButton继承自UIControl，点击but时会调用

- (void)sendAction:(SEL)action to:(nullable id)target forEvent:(nullable UIEvent *)event;方法

代码：

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface UIButton(PlaySound)

@end

#import "ButtonPlaySound.h"
#import<objc/runtime.h>
#import <AudioToolbox/AudioToolbox.h>

@implementation UIButton(PlaySound)

+(void)load

    Method originalMethod = class_getInstanceMethod(self, @selector(sendAction:to:forEvent:));
    Method myMethod = class_getInstanceMethod(self, @selector(mySendAction:to:forEvent:));
    //用自己的mySendAction方法，与sendAction方法进行交换
    method_exchangeImplementations(originalMethod, myMethod);


//交换后，点击but会调用mySendAction
- (void)mySendAction:(SEL)action to:(nullable id)target forEvent:(nullable UIEvent *)event

    //震动
    AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
    //此处调用mySendAction，实际调用的是sendAction
    [self mySendAction:action to:target forEvent:event];



@end