AppDelegate object can access from any class in the same application like below. Methods or properties shared between controllers can be defined under application delegates.
SomeAppDelegate *appDelegate
= (SomeAppDelegate *)[[UIApplication sharedApplication] delegate];
Use NSSearchPathForDirectoriesInDomains(). First argument “NSDocumentDirecotry” is the key to specify special directory, in this case Document directory under the application. The method returns absolute path expression.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(@"NSDocumentDirectory is %@", documentsDirectory);
Apparently a UIColor is not necessarily a single color, but can be a pattern as well. Confusingly, this is not supported in Interface Builder.
Instead you set the backgroundColor of the view (say, in -viewDidLoad) with the convenience method +colorWithPatternImage: and pass it a UI Image. For Instance:
Animation can be applied while its frame, bounds, center, transform, alpha… is being changed. The key is set start and end values between beginAnimations and commitAnimations, so called animation block.
UIAlertView takes care of this
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Alert View"
message:@"Here is an alert message"
delegate:nil
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"OK", nil];
[alert show];
// Since alert object is allocated above, it must be released here
[alert release];
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