Iphone development skills

Iphone development skills

1. modify the status bar:

1. Add [[UIApplication sharedApplication] setStatusBarHidden: YES animated: NO]. However, this method only does not display status bars, and the space occupied by status bars still exists.

2. You can modify the Info. plist file, add a new key value to the info. plist file, name it UIStatusBarHidden, select Valuetype as Boolean, and re-compile and run it.

3. Modify the display direction:

[[UIApplication sharedApplication] setStatusBarOrientation: UIInterfaceOrientationLaNdscapeRight animated: NO];

4. Obtain the project name.

// Obtain the project name and set it to the title of the current view.

Self. title = [[[NSBundle mainBundle] infoDictionary] objectForKey: @ CFBundleName];

5. Set the current view to support touch

SetUserInteractionEnableD: YES;

6. Button. userInteractionEnabled = NO. The Button stops accepting any events.

7. Button. Enabled = NO, the Button is not displayed

8. Get the current mouse position

[NSEvent mouseLocation];

9. Refresh the UITableViewrController View

[Self. TableView reloadData];

10.

Convert string to int

IntegerValue method of NSString

11. Convert the integer to StringWithFormat;

12. Make a simple animation:

-(IBAction) curlAction :( id) sender

{

// Start an animation

[UIView beginAnimations: nil context: NULL];

// Set the animation Interval

[UIView setAnimationDuration: kTransitionDuration];

// Set the animation rotation Mode

[UIView setAnimationTransition :( [self. mainView superview]?

UIViewAnimationTransitioNCurlUp: UIViewAnimationTransitioNCurlDown)

ForView: self. containerView cache: YES];

If ([self. flipToView superview])

{

[Self. flipToView removeFromSuperview];

[Self. containerView addSubview: self. mainView];

}

Else

{

[Self. mainView removeFromSuperview];

[Self. containerView addSubview: self. flipToView];

}

[UIView commitAnimations];

}

13. Use a random number

Use srandom ()

Random (unsigned) (macn_absolute_time () & 0 xFFFFFFFF ));

14. In Quartz, how does one set the rotation point?

UIImageView * imageview = [[UIImageview alloc] initWithImage: [UIImage imageNamed: @bg.png];

ImageView. layer. anchorPoint = CGPointMake (0.5, 1.0 );

15. Hide NavigationBar

[Self. navigationController setNavigationBarHidden: YES animated: YES];

16. Get coordinate (coordinates) based on CLLocation and open google map:

NSString * mapUrl = [NSString stringWithFormat: @ http://maps.google.com/maps? Q = % f, % f, loc. latitude, loc. longpolling];

NSURL * url = [NSURL URLWithString: mapUrl];

[[UIApplication sharedApplication] openURL: url];

17. Date formatting:

NSDataFormat * format = [NSDateFormat alloc]Init];

[Format setDateFormat: @ hh: mm: ss];

NSDate * noew = [NSDate date];

NSString * str = [format stringFromDate: now];

18. WebView usage:

WebView loadRequest: [NSURLRequest alloc] initwithURL: [NSURL alloc] initWithStringt: @ http://www.google.com];

18. Call method through notification:

UIApplication * app = [UIApplication sharedApplication];

[[Nsicationicationcenter defacenter center] addObserve: self

Selector: @ selector (xxx :)

Name: UIApplicationWillTerminaTeNofification

Object: app];

19. How to traverse all views:

The cell is UITableViewCell,

For (UIView * oneView in cell. contentView. subviews)

{

If ([oneView isMemberOfClass: [UITextField class])

{

TextField = (UITextField *) oneView;

}

}

20.

1. Playing background music Supports loop playback of long music in mp3 format

This method of playing music is imported into the framework # import;

NSString * musicFilePath = [[NSBundle mainBundle] pathForResource: @ changan ofType: @ mp3]; // Create a music file path

NSURL * musicURL = [[NSURL alloc] initFileURLWithPath: musicFilePath];

AVAudioPlayer * thePlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: musicURL error: nil];

// Create a player

Self. myBackMusic = thePlayer; // Assign a value to the defined class variable

[MusicURL release];

[ThePlayer release];

[MyBackMusic prepareToPlay];

[MyBackMusic setVolume: 1]; // Set the volume.

MyBackMusic. numberOfLoops =-1; // sets the number of times the music is played. -1 indicates a continuous loop.

If (mainMusicStatus)

{

[MyBackMusic play]; // Play

}

2. Button playing sound Play short sound

Need to import framework # import

NSString * thesoundFilePath = [[NSBundle mainBundle] pathForResource: @ Clapping Crowd Studio 01 ofType: @ caf]; // Create a music file path

CFURLRef thesoundURL = (CFURLRef) [NSURL fileURLWithPath: thesoundFilePath];

AudioServicesCreateSysteMSoundID (thesoundURL, & sameViewSoundID );

// The SoundID variable corresponds to the URL

AudioServicesPlaySystemSOund (sameViewSoundID ); // Play the SoundID sound

21. Set UILabel line feed

UILabel * label;
// Set line feed
Label. lineBreakMode = UILineBreakModeWordWrap;
Label. numberOfLines = 0;
Line break or n
For example, NSString * xstring = @ lineonenlinetwo