Trimming strings in Objective-C / Cocoa
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returnString = [returnString stringByTrimmingCharactersInSet:
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[NSCharacterSet whitespaceAndNewlineCharacterSet]];
Very intuitive, huh?
Placing a UIActivityIndicartorView on a UIBarButtonItem
Have you seen those iPhone apps with a reload button that switches itself to an animated activity indicator while the reload action is being performed?
Here is how to do that. Place this code on your ViewController:
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- (void)showReloadButton {
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UIBarButtonItem *refreshItem = [[UIBarButtonItem alloc]
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initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
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target:self
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action:@selector(reload:)];
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self.navigationItem.rightBarButtonItem = refreshItem;
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[refreshItem release];
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}
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- (void)showActivityIndicator {
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UIActivityIndicatorView *activityIndicator =
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[[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
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[activityIndicator startAnimating];
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UIBarButtonItem *activityItem =
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[[UIBarButtonItem alloc] initWithCustomView:activityIndicator];
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[activityIndicator release];
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self.navigationItem.rightBarButtonItem = activityItem;
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[activityItem release];
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}
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- (IBAction) reload {
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// Do your reload stuff
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}
Seen here.
MyGameOfLife source code
Almost a year ago I was learning some Cocoa and I decided it will be fun to implement a Cocoa based version of Conway’s Game of Life. Back then I didn’t publish the source code, not for any special reason. So now I have just uploaded it to Google Code. It’s not fully functional, since the last time I worked on it I was creating an structure editor. My idea was to create a library of structures, with drag&drop and import/export options.
If you are interested on working on the project, let me know :)
http://code.google.com/p/my-gameoflife
