加速度計,用于檢測在三個方向上的x,y和z中的移動設(shè)備的位置的變化。我們可以知道相對于地面的移動設(shè)備的當(dāng)前位置。為了測試這個例子,需要它在運行設(shè)備中,模擬器是行不通的。
涉及到以下步驟
1. 創(chuàng)建一個簡單的 View based application.
2. 添加三個標(biāo)簽在 ViewController.xib 并創(chuàng)建ibOutlets 命名為 them as xlabel, ylabel 和 zlabel.
3. 更新 ViewController.h 代碼如下
#import <UIKit/UIKit.h> @interface ViewController : UIViewController<UIAccelerometerDelegate> { IBOutlet UILabel *xlabel; IBOutlet UILabel *ylabel; IBOutlet UILabel *zlabel; } @end
4. 更新 ViewController.m 代碼如下
#import "ViewController.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; [[UIAccelerometer sharedAccelerometer]setDelegate:self]; //Do any additional setup after loading the view,typically from a nib } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate: (UIAcceleration *)acceleration{ [xlabel setText:[NSString stringWithFormat:@"%f",acceleration.x]]; [ylabel setText:[NSString stringWithFormat:@"%f",acceleration.y]]; [zlabel setText:[NSString stringWithFormat:@"%f",acceleration.z]]; } @end
現(xiàn)在,當(dāng)我們運行應(yīng)用程序在 iPhone設(shè)備中,我們將得到下面的輸出。