DiesDas Snippet

format UIDatePicker if labels background white
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NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss zzzzz"];

NSString *stringyDate = @"2014-06-02 10:10:00 +0000";
NSDate *helperDate = [dateFormatter dateFromString:stringyDate];
datePickerDueDate.date = helperDate;

stringyDate = @"2031-01-13 19:43:00 +0000";
helperDate = [dateFormatter dateFromString:stringyDate];
datePickerDueDate.date = helperDate;

represent two dimensional array in a single ( two for loops in just one )
-------------------------------------------------------------------------

    NSMutableArray *elements = [NSMutableArray new];
    
    for (int i = 0; i < kNumberOfElements * kNumberOfElements; i++) {
        int x = i % kNumberOfElements;
        int y = i / kNumberOfElements;
        
        CGRect rectAnswer = CGRectMake(x * _fElementSize,
                                       y * _fElementSize,
                                       _fElementSize,
                                       _fElementSize);
        
        CrosswordSubRect *tempSubRect = _arrayDataModel[_iRow][_iColumn];
        [tempSubRect setRectFrame:rectAnswer];
        [tempSubRect setupCell];
        [tempSubRect setCrosswordName:self.strCrosswordName];
        
        [elements addObject:tempSubRect];
    }
    
    
    id element = elements[5 + 7 * kNumberOfElements]; //X:5 Y:7



Calculate timespan for method execution
---------------------------------------

NSDate *methodStart = [NSDate date];

  // execute method

NSDate *methodFinish = [NSDate date];
NSTimeInterval executionTime = [methodFinish timeIntervalSinceDate:methodStart];
NSLog(@"Executiontime  >>> %f", executionTime);

Un / archive objects with NSKeyedArchiver / NSKeyedUnarchiver
-------------------------------------------------------------

- Each object needs to include `NSCoding` inside the 
  header and initWithCoder, encodeWith inside the implementation

- (NSMutableDictionary *)getDataFromArray:(NSMutableArray *)arrayData{
    
    NSMutableDictionary *dictFromArray = [[NSMutableDictionary alloc] init];
    for (int i = 0; i < [arrayData count]; i++) {
        
        NSMutableArray *arraySub = arrayData[i];
        for (int j = 0; j < [arraySub count]; j++) {
            NSString *strKey = [NSString stringWithFormat:@"%d-%d", j, i];
            dictFromArray[strKey] = [NSKeyedArchiver archivedDataWithRootObject:arraySub[j]];
        }
    }
    return dictFromArray;
}

- (void)getArrayFromDictFromUserDefaults:(NSMutableDictionary *)dictData{

    for (int i = 0; i < kNumberOfElements; i++) {
        NSMutableArray *subArray = [[NSMutableArray alloc] init];
        
        for (int j = 0; j < kNumberOfElements; j++) {
            NSString *strKey = [NSString stringWithFormat:@"%d-%d", j, i];
            CrosswordSubRect *subrect =
             [NSKeyedUnarchiver unarchiveObjectWithData:dictData[strKey]];
            [subArray addObject:subrect];
        }
        [_arrayCrosswordData addObject:subArray];
    }
}

Get parentViewController of UINavigationController
--------------------------------------------------

NSUInteger numberOfViewControllersOnStack = [self.navigationController.viewControllers count];
ViewController *parentViewController = self.navigationController.viewControllers[numberOfViewControllersOnStack - 2];
Class parentVCClass = [parentViewController class];
NSString *className = NSStringFromClass(parentVCClass);


Create a custom debug NSLog in xcode
------------------------------------

- set "preprocessor macros" ---> DEBUG=1
- insert ExtendNSLogFunctionallity classes into project
- #import "ExtendNSLogFunctionality.h" ---> .pch

to create a specific log follow this tutorial:
http://mobile.tutsplus.com/tutorials/iphone/customize-nslog-for-easier-debugging/

URL Schemes - Call other apps within an app
-------------------------------------------

- check if app available
  if ([[UIApplication sharedApplication] canOpenURL:@"whatsapp://"]) //do something
  
CocoaPods stuff
---------------
- install cocoa pods on project
touch Podfile (in dir of xcodeproj)
nano Podfile
--> insert and save
  platform :ios, '5.0'
  pod '[FrameworkName]', '~> 0.2'
pod install

pod search [name]
pod install

- turning off warning messages, change Podfile and use pod install again
pod '[framework]', [version], :inhibit_warnings => true

Implement Facebook events
-------------------------

- install newest sdk with pod
- insert header #import <FacebookSDK/FacebookSDK.h>
- insert in applicationDidBecomeActive
    [FBSettings setDefaultAppID:kAppIdFacebook];
    [FBAppEvents activateApp];

- insert other events like
    [FBAppEvents logEvent:@"MyEvent"];


Implement MMDrawer
------------------

- (void)viewDidLoad{

    [super viewDidLoad];

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil];
    
    highScore = (HighScore *)[storyboard instantiateViewControllerWithIdentifier:@"HighScore"];
    details = (Details *)[storyboard instantiateViewControllerWithIdentifier:@"Details"];
    
    [self setCenterViewController:highScore];
    [self setLeftDrawerViewController:details];
    
    [self setShouldStretchDrawer:NO];
    [self setRestorationIdentifier:@"HighScore"];
    [self setMaximumLeftDrawerWidth:290.0];
    [self setOpenDrawerGestureModeMask:MMOpenDrawerGestureModeAll];
    [self setCloseDrawerGestureModeMask:MMOpenDrawerGestureModeAll];
}

Create a circle and add an animation
------------------------------------

- Define variables
  CAShapeLayer *circle, *circle2;
  CABasicAnimation *drawAnimation, *colorSwitch;
    
- Create Circles and add them to your view
  int radius = _imageViewCircle.frame.size.width;
    
    circle = [CAShapeLayer layer];
    circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, radius, radius)
                                             cornerRadius:radius].CGPath;
    circle.position = CGPointMake(_imageViewCircle.frame.origin.x,
                                  _imageViewCircle.frame.origin.y);
    circle.fillColor = [[UIColor clearColor] CGColor];
    circle.strokeColor = [UIColor colorFromHexString:kColorQuestionRight].CGColor;
    circle.lineWidth = 4;
    
    circle2 = [CAShapeLayer layer];
    circle2.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, radius, radius)
                                              cornerRadius:radius].CGPath;    // Make a circular shape
    circle2.position = CGPointMake(_imageViewCircle.frame.origin.x,
                                   _imageViewCircle.frame.origin.y);    // Center the shape in self.view
    circle2.fillColor = [UIColor clearColor].CGColor;    // Configure the apperence of the circle
    circle2.strokeColor = [UIColor colorFromHexString:kColorQuestionWrong].CGColor;
    circle2.lineWidth = 4;
    
    // Add to parent layer
    [self.view.layer addSublayer:circle2];
    [self.view.layer addSublayer:circle];
    
- Define the animations and add them to the circles

  float animationDuration = 2.0;
    drawAnimation     = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    drawAnimation.duration              = animationDuration; // "animate over 10 seconds or so.."
    drawAnimation.repeatCount           = 1.0;  // Animate only once..
    drawAnimation.removedOnCompletion   = NO;   // Remain stroked after the animation..
    drawAnimation.fromValue             = [NSNumber numberWithFloat:0.0f];
    drawAnimation.toValue               = [NSNumber numberWithFloat:1.0f];
    drawAnimation.delegate              = (id) self;
    drawAnimation.timingFunction        = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
    
    colorSwitch   = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    colorSwitch.duration            = animationDuration; // "animate over 10 seconds or so.."
    colorSwitch.repeatCount         = 1.0;  // Animate only once..
    colorSwitch.removedOnCompletion = NO;   // Remain stroked after the animation..
    colorSwitch.fromValue           = [NSNumber numberWithFloat:0.0f];
    colorSwitch.toValue             = [NSNumber numberWithFloat:1.0f];
    colorSwitch.delegate            = (id) self;
    colorSwitch.timingFunction      = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
    
    // Add the animation to the circle
    [circle addAnimation:drawAnimation forKey:@"drawCircleAnimation"];
    //[circle2 addAnimation:colorSwitch forKey:@"drawColorSwitch"];
  
------> TO SWITCH BETWEEN THE CIRCLES USE ANIMATION DELEGATE METHOD  

-(void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{

    if(flag){ //if animation hasn't stopped correctly the switch won't happen again
        
        if([circle animationForKey:@"drawCircleAnimation"] == anim){
            
            [circle2 addAnimation:colorSwitch forKey:@"drawColorSwitch"];
            circle.zPosition = 1;
            circle2.zPosition = 2;
        } else {
            
            [circle addAnimation:drawAnimation forKey:@"drawCircleAnimation"];
            circle2.zPosition = 1;
            circle.zPosition = 2;
            
        }
    }
}

tips build phases
-----------------

-fno-objc-arc           // allow arc
-w			//surpress warnings

resize image to fit scale
-------------------------
  resizeFactor = 1000.0f / 666.0f;      
  screenWidth = [UIScreen mainScreen].bounds.size.width;
  screenHeight = [UIScreen mainScreen].bounds.size.height;
  float imageWidth = screenHeight * resizeFactor;
  [self.imageViewSplash setFrame:CGRectMake((-1 * (imageWidth / screenWidth / 2)), 0,
                                                 imageWidth, screenHeight)];

sorting an array
---------------
https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Collections/Articles/Arrays.html#//apple_ref/doc/uid/20000132-SW5

button alignment and managing subviews
--------------------------------------
[_buttonCommercial setContentHorizontalAlignment:UIControlContentHorizontalAlignmentRight];
[_buttonCommercial setContentEdgeInsets:UIEdgeInsetsMake(0, 0, 0, 5)];
[_buttonCommercial insertSubview:badge belowSubview:_buttonCommercial.titleLabel];

INFO: If UIView is used as a subview, the button doesn't get the touch events anymore.

stop userinteraction completely
-------------------------------
[[UIApplication sharedApplication] beginIgnoringInteractionEvents];
[[UIApplication sharedApplication] endIgnoringInteractionEvents];

create UIDocumentInteractionController
--------------------------------------

@property (strong, nonatomic) UIDocumentInteractionController *documentInteractionController;

UIButton *button = (UIButton *)sender;
[NSString writeStringToFile:_textView.text];
NSURL *url = [[NSBundle mainBundle] URLForResource:@"text" withExtension:@"txt"];
NSLog(@"url: %@", url);

if(url){
    self.documentInteractionController = [UIDocumentInteractionController interactionControllerWithURL:url];
    [self.documentInteractionController setDelegate:self];
    [self.documentInteractionController presentOptionsMenuFromRect:[button frame] inView:self.view animated:YES];
}

-(UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller{
    return self;
}

open another app inside ios app
-------------------------------

  NSURL *whatsappURL = [NSURL URLWithString:@"whatsapp://"];
  if ([[UIApplication sharedApplication] canOpenURL: whatsappURL]) {
     [[UIApplication sharedApplication] openURL: whatsappURL];
  }