iOS

CGAffineTransform.textile

APPLE

• https://developer.apple.com/library/mac/documentation/GraphicsImaging/Reference/CGAffineTransform/Reference/reference.html#//apple_ref/c/func/CGAffineTransformMakeTranslation

Stack Overflow

• http://stackoverflow.com/questions/12513092/applying-a-scale-affinetransform-to-a-uiview-changes-its-center
• http://stackoverflow.com/questions/5995923/cgaffinetransform-reset

Ray Wenderlich

• http://www.raywenderlich.com/5478/uiview-animation-tutorial-practical-recipes
• http://www.raywenderlich.com/34003/core-graphics-tutorial-curves-and-layers
• http://www.raywenderlich.com/2454/uiview-tutorial-for-ios-how-to-use-uiview-animation

Other

• http://www.informit.com/articles/article.aspx?p=1951182
• http://iphonedevelopment.blogspot.com/2008/10/demystifying-cgaffinetransform.html
• http://x-code-tutorials.com/tag/cgaffinetransform/

coredata.textile

Core Data

• Core Data Deletions Many to Many

- (void)willSave
{
    if (self.isDeleted)
        return;

    if (self.products.count == 0)
        [self.managedObjectContext deleteObject:self];
}

crypto.textile

• hashing user password for client / server application
• Alan Quatermain
• Basic Security in iOS5 – Ray Wenderlich

NSString* encryptionPass = @"myEncryptionPass";
NSData* passData = [userPassword dataUsingEncoding:NSStringEncodingConversionAllowLossy];
NSError* error = nil;
NSData* encryptedPassData = [passData AES256EncryptedDataUsingKey:encryptionPass error:&error];
if(!error)
{
     NSString* encryptedString = [[NSString alloc] initWithData:encryptedPassData encoding:NSUTF8StringEncoding]
}

keyboard.m

// http://stackoverflow.com/questions/15402281/convert-uikeyboardframeenduserinfokey-to-view-or-windows-coordinates

+ (void)parseKeyboardNotification:(NSNotification *)notification
                 inRelationToView:(UIView *)view
                             info:(void(^)(NSTimeInterval keyboardAnimationDuration, CGRect keyboardFrameInView, UIViewAnimationOptions keyboardAnimationOptions))callback
{
    NSParameterAssert(notification != nil);
    NSParameterAssert(view != nil);

    NSDictionary *userInfo = [notification userInfo];

    UIViewAnimationCurve animationCurve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
    UIViewAnimationOptions animationOption = animationCurve << 16; // https://devforums.apple.com/message/878410#878410
    NSTimeInterval animationDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    // http://stackoverflow.com/a/16615391/202451
    CGRect screenRect    = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGRect windowRect    = [view.window convertRect:screenRect fromWindow:nil];
    CGRect viewRect      = [view        convertRect:windowRect fromView:nil];

    callback(animationDuration, viewRect, animationOption);
}

// http://stackoverflow.com/questions/2807339/uikeyboardboundsuserinfokey-is-deprecated-what-to-use-instead

- (void)keyboardWillShow:(NSNotification *)aNotification {
    [self moveTextViewForKeyboard:aNotification up:YES];
}

- (void)keyboardWillHide:(NSNotification *)aNotification {
    [self moveTextViewForKeyboard:aNotification up:NO];
}

- (void) moveTextViewForKeyboard:(NSNotification*)aNotification 
                              up:(BOOL)up {
    NSDictionary* userInfo = [aNotification userInfo];
    
    // Get animation info from userInfo
    NSTimeInterval animationDuration;
    UIViewAnimationCurve animationCurve;
    
    CGRect keyboardEndFrame;
    
    [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] getValue:&animationCurve];
    [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration];
    
    
    [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardEndFrame];
    
    
    // Animate up or down
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:animationDuration];
    [UIView setAnimationCurve:animationCurve];
    
    CGRect newFrame = textView.frame;
    CGRect keyboardFrame = [self.view convertRect:keyboardEndFrame toView:nil];
    
    newFrame.origin.y -= keyboardFrame.size.height * (up? 1 : -1);
    textView.frame = newFrame;
    
    [UIView commitAnimations];
}

// http://spin.atomicobject.com/2014/01/08/animate-around-ios-keyboard/
// http://masteringios.com/blog/2013/10/04/how-to-make-uitextfield-move-up-when-keyboard-is-present/

NSArray.textile

Predicates

• NSPredicate
• Filter NSArray into a new NSArray
• Remove Object from NSArray
• NSArray Remove Item from Array

@implementation NSArray (Additions)

- (instancetype)arrayByRemovingObject:(id)object {
    return [self filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF != %@", object]];
}

@end

Enumerations

• Objective-C enumerateUsingBlock vs fast enumeration?
• NSFastEnumeration / NSEnumerator

UIImage.textile

UIImage

• How to create a colored 1×1 UIImage on the iPhone dynamically?

+ (UIImage *)imageWithColor:(UIColor *)color {
    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

UIStatusBar.mm

// UIViewController
// http://stackoverflow.com/questions/18979837/how-to-hide-ios-7-status-bar

- (BOOL)prefersStatusBarHidden { 
   return YES; 
}

UIStoryboardSegue.mm

- (IBAction)myButtonMethod {
    [self performSegueWithIdentifier:@"segueName" sender:self];
}