iOS Tips for beginner

2013年7月16日

ネットサーフィングしながらかき集めたTIPS.
いつか誰かの役に立つはず。（自分含む）

  1. Open an URL in Safari
    2. [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.google.com/"]];
  2. Hide the status bar
    3. [[UIApplication sharedApplication] setStatusBarHidden:YES animated:NO];
  3. Dial a Phone Number (iPhone Only)
    4. [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://9662256888"]];
  4. Launch the Apple Mail
    5. [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://mymail@myserver.com"]];
  5. stop responding to touch events
    6. [[UIApplication sharedApplication] beginIgnoringInteractionEvents];
  6. active the touch events
    7. [[UIApplication sharedApplication] endIgnoringInteractionEvents];
  7. Show the network Activity Indicator
    8. [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
  8. Hide the network Activity Indicator
    9. [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
  9. Prevents iPhone goes into sleep mode
    10. [UIApplication sharedApplication].idleTimerDisabled = YES;
[UIApplication sharedApplication].applicationIconBadgeNumber = 10;
  10. Display an alert window
    11. UIAlertView* alert = [[[UIAlertView alloc] initWithTitle:@"Warning" message:@"too many alerts" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
[alert show]
  11. Get the path to the Documents folder
    12. NSArray*  paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString* documentsDirectory = [paths objectAtIndex:0];
  12. Push another view controller onto the Navigation Bar
    13. [self.navigationController pushViewController:anotherVC animated:YES];
  13. Fade away a UIView by animating the alpha down to 0
    14. [UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1];  // fade away over 1 seconds
[aView setAlpha:0]; 
[UIView commitAnimations];
  14. Get the name of the app
    15. self.title = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleName"];
  15. Change the status bar to black
    16. [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackOpaque];
Change the style of the navigation bar (from in a view controller):
self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
  16. Save a NSString into NSUserDefaults
    17. NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:loginName forKey:kUserLoginName];
Get an NSString from NSUserDefaults:
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
NSString* loginName = [defaults stringForKey:kUserLoginName];
  17. Check to make sure an objects support a method before calling it
    18. if ([item respondsToSelector:@selector(activateBOP:)]) {
    [item activateBOP:closeBOP];
}
  18. Log the name of the class and function
    19. 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
  19. Open Google Maps app with directions between two lat/long points
    20. 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]];
  20. Save bool to User Defaults
    21. [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"Yes Bool"];
  21. Copy a file from x to y
    22. [[NSFileManager defaultManager] copyItemAtPath:x toPath:y error:nil];
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<li>Display a new view</li>
1
[self presentModalViewController:(UIViewController *) animated:YES];
  22. Screen touches method
    23. - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {}
  23. Get documents directory
    24. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
  24. Load URL
    25. [MyWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://couleeapps.hostei.com"]]];
  25. Get Current Date and time
    26. 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;
  26. Quartz draw arc
    27. CGContextRef ctxt = UIGraphicsGetCurrentContext();
CGContextAddArc(ctxt, x, y, radius, startDeg, endDeg);
  27. Make the device vibrate
    28. AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
  28. Open the Messages app with a specific phone number
    29. [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms:123456789"]];
  29. Stop responding to touch events
    30. [[UIApplication sharedApplication] beginIgnoringInteractionEvents];
  30. Start responding again
    31. [[UIApplication sharedApplication] endIgnoringInteractionEvents];
  31. single line of code browser
    32. [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString: [urlText stringValue]]]];
  32. Change the title on the back button on a UINavigationView. Use this code on the UINavigationController before pushing the view
    33. UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Back" style: UIBarButtonItemStyleBordered target:nil action:nil];
self.navigationItem.backBarButtonItem = backBarButtonItem;
[backBarButtonItem release];

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