iOS开发摇动手势实现详解

1.当设备摇动时，系统会算出加速计的值，并告知是否发生了摇动手势。系统只会运动开始和结束时通知你，并不会在运动发生的整个过程中始终向你报告每一次运动。例如，你快速摇动设备三次，那只会收到一个摇动事件。

2，想要实现摇动手势，首先需要使视图控制器成为第一响应者，注意不是单独的控件。成为第一响应者最恰当的时机是在视图出现的时候，而在视图消失的时候释放第一响应者。

-(BOOL)canBecomeFirstResponder
{
    return YES;
}

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self becomeFirstResponder];
}

-(void)viewWillDisappear:(BOOL)animated
{
    [self resignFirstResponder];
    [super viewWillDisappear:animated];
}

现在，视图控制器准备处理运动事件，其中有三个方法，motionBegan，motionEnded和motionCancelled，这些与触摸方法有着相似的工作原理，但没有移动方法。

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (event.type == UIEventSubtypeMotionShake)
    {
        NSLog(@"Shake Began");
    }
}

-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (event.type == UIEventSubtypeMotionShake)
    {
        NSLog(@"Shake End");
    }
}

-(void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (event.type == UIEventSubtypeMotionShake)
    {
        NSLog(@"Shake Cancelled");
    }
}

以上是转载自http://blog.****.net/marvindev

我的代码：

//
//  ocqViewController.m
//  shake
//
//  Created by ocq on 14-4-29.
//  Copyright (c) 2014年 ocq. All rights reserved.
//

#import "ocqViewController.h"

@interface ocqViewController ()

@end

@implementation ocqViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSLog(@"初始化了实例");
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(BOOL)canBecomeFirstResponder
{
    return YES;
}

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self becomeFirstResponder];
}

-(void)viewWillDisappear:(BOOL)animated
{
    [self resignFirstResponder];
    [super viewWillDisappear:animated];
}

////当手机移动结束时调用该方法
#pragma motion移动的类型 UIEvent事件
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{

    //如果是摇手机类型的事件
    if(motion==UIEventSubtypeMotionShake){

NSLog(@"摇动了手机");

//创建并初始化对话框 UIAlertView *show=[[UIAlertView alloc] initWithTitle:@"ocq ios 学习" message:@"恭喜，您查找到了好友" delegate:nil cancelButtonTitle:@"添加为好友" otherButtonTitles: nil]; //显示对话框 [show show]; // [show release]; 
} 
} 
@end