New to Objective-C iPhone/iPod touch/iPad development, but I'm starting to discover lots of power in one-liners of code such as this:
[UIApplication sharedApplication].applicationIconBadgeNumber = 10;
Which will display that distinctive red notification badge on your app iphone with the number 10.
Please share you favorite one or two-liners in Objective-C for the iPhone/iPod touch/iPad here. PUBLIC APIs ONLY .
Open an URL in Safari
ReplyDelete[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.google.com/"]];
Hide the status bar
[[UIApplication sharedApplication] setStatusBarHidden:YES animated:NO];
Dial a Phone Number (iPhone Only)
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://9662256888"]];
Launch the Apple Mail
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://mymail@myserver.com"]];
stop responding to touch events
[[UIApplication sharedApplication] beginIgnoringInteractionEvents];
active the touch events
[[UIApplication sharedApplication] endIgnoringInteractionEvents];
Show the network Activity Indicator
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
Hide the network Activity Indicator
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
Prevents iPhone goes into sleep mode
[UIApplication sharedApplication].idleTimerDisabled = YES;
Display an alert window:
ReplyDeleteUIAlertView* alert = [[[UIAlertView alloc] initWithTitle:@"Warning" message:@"too many alerts" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
[alert show]
Get the path to the Documents folder:
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [paths objectAtIndex:0];
Push another view controller onto the Navigation Bar:
[self.navigationController pushViewController:anotherVC animated:YES];
Fade away a UIView by animating the alpha down to 0:
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1]; // fade away over 1 seconds
[aView setAlpha:0];
[UIView commitAnimations];
Get the name of the app
self.title = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleName"];
Change the status bar to black
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackOpaque];
Change the style of the navigation bar (from in a view controller):
self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
Save a NSString into NSUserDefaults:
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:loginName forKey:kUserLoginName];
Get an NSString from NSUserDefaults:
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
NSString* loginName = [defaults stringForKey:kUserLoginName];
Check to make sure an objects support a method before calling it:
if ([item respondsToSelector:@selector(activateBOP:)]) {
[item activateBOP:closeBOP];
}
Log the name of the class and function:
NSLog(@"%s", __PRETTY_FUNCTION__);
Add rounded corners and/or a border around any UIView item (self)
self.layer.borderColor = [UIColor whiteColor].
self.layer.cornerRadius = 8; // rounded corners
self.layer.masksToBounds = YES; // prevent drawing outside border
Open Google Maps app with directions between two lat/long points
NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=%f,%f&daddr=%f,%f&dirflg=d", start.latitude, start.longitude, finish.latitude, finish.longitude];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString]];
Save bool to User Defaults
ReplyDelete[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"Yes Bool"];
Copy a file from x to y
[[NSFileManager defaultManager] copyItemAtPath:x toPath:y error:nil];
Display a new view
[self presentModalViewController:(UIViewController *) animated:YES];
Screen touches method
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {}
Get documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
Load URL
[MyWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://couleeapps.hostei.com"]]];
Get Current Date and time:
NSCalendar *gregorian = [NSCalendar currentCalendar];
NSDateComponents *dateComponents = [gregorian components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:[NSDate date]];
Own enum type:
typedef enum {
a = 0, b = 1, c = 2
} enumName;
Quartz draw arc
CGContextRef ctxt = UIGraphicsGetCurrentContext();
CGContextAddArc(ctxt, x, y, radius, startDeg, endDeg);
Make the device vibrate:
ReplyDeleteAudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
Open the Messages app with a specific phone number:
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms:123456789"]];
Stop responding to touch events:
[[UIApplication sharedApplication] beginIgnoringInteractionEvents];
Start responding again:
[[UIApplication sharedApplication] endIgnoringInteractionEvents];
And finally, the single line of code browser:
[[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString: [urlText stringValue]]]];
Change the title on the back button on a UINavigationView. Use this code on the UINavigationController before pushing the view
ReplyDeleteUIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Back" style: UIBarButtonItemStyleBordered target:nil action:nil];
self.navigationItem.backBarButtonItem = backBarButtonItem;
[backBarButtonItem release];