I was creating a project for a learning exercise, using the accelerometer.
I have the basic functionality of the code, now I just need to make it do something. Display a message, play audio, or display an image.
!! EDIT !!
// ACViewController.m
// Accelerometer
//
#import "ACViewController.h"
@interface ACViewController ()
- (void) startAccelerometer;
- (void) stopAccelerometer;
@end
@implementation ACViewController
- (void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{ //!!EDIT!!
double const kThreshold = 2.0;
if ( fabsf(acceleration.x) > kThreshold
|| fabsf(acceleration.y) > kThreshold
|| fabsf(acceleration.z) > kThreshold)
UILabel * theLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 320, 640)];
theLabel.text = @"Hello earth";
[self.theLabel addSubView:theLabel];
//END OF EDIT }
- (void)startAccelerometer {
UIAccelerometer *accelerometer = [UIAccelerometer sharedAccelerometer];
accelerometer.delegate = self;
accelerometer.updateInterval = 0.25;
}
- (void)stopAccelerometer {
UIAccelerometer *accelerometer = [UIAccelerometer sharedAccelerometer];
accelerometer.delegate = nil;
}
- (void)viewDidAppear:(BOOL)animated {
[self startAccelerometer];
}
- (void)viewWillDisappear:(BOOL)animated {
[self stopAccelerometer];
}
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Header File:
//
// ACViewController.h
// Accelerometer
#import <UIKit/UIKit.h>
@interface ACViewController : UIViewController <UIAccelerometerDelegate>
@end
Example for adding an image (and assuming you use ARC):
In the line with the NSLog, type:
[self.view addSubView:[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"myImage.png"]]];
Example for a label (ARC):
UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 320, 640)];
label.text = @"Hello earth";
[self.view addSubView:label];
When not using ARC, release the instances after adding them to the view.