9.28.1. Brief introduction ¶
The accelerometer detects the change in the position of the device according to the x, y and z directions.
The position of the current equipment relative to the ground can be known through the accelerometer.
The following example code needs to run on a real device and does not work on the simulator.
9.28.2. Instance step ¶
1、创建一个简单的视图应用程序
2、在ViewController.xib中添加三个标签，并创建一个ibOutlets分别为：xlable、ylabel和zlabel
3、如下所示，更新ViewController.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UIAccelerometerDelegate>
{
IBOutlet UILabel *xlabel;
IBOutlet UILabel *ylabel;
IBOutlet UILabel *zlabel;
}
@end
4、如下所示，更新ViewController.m
#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
9.28.3. Output ¶
When we run the application on the iPhone device, the output is shown below.
