Snippets

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Check if device is iPad

if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

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Check rotation of screen

UIInterfaceOrientationIsPortrait([[UIApplication sharedApplication] statusBarOrientation])

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If you change a UIView's transform, don't use frame anymore

Warning: If the transform property is not the identity transform, the value of this property is undefined and therefore should be ignored.

http://developer.apple.com/library/ios/documentation/uikit/reference/UIView_Class/UIView/UIView.html#//apple_ref/doc/uid/TP40006816-CH3-SW5

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Finding objects in an NSSet using objectsPassingTest

- (myObject *)findObjectWithDescription:(NSString*)d in:(NSSet*)set

{

        [set objectsPassingTest:^(id obj, BOOL *stop)

  {

    if([d isEqualToString:((myObject*)obj).description)

{

*stop = YES;

return YES;

}

else

{

return NO;

}

}];

}

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When to use NSOrderedSet?

"You can use ordered sets as an alternative to arrays when the order of elements is important and performance in testing whether an object is contained in the set is a consideration— testing for membership of an array is slower than testing for membership of a set."

https://developer.apple.com/library/mac/#documentation/Foundation/Reference/NSOrderedSet_Class/Reference/Reference.html

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Always label your stashs

git stash save "MESSAGE HERE"

Then when you view stashes with

git stash list

You'll know what the stash was about without having to read which file changed (git stash show STASHID)

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Don't nest MACROS

MAX( x, MIN( y, z)) does not work!

Expand it to see why.

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Animate CALayer property startPoint

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"startPoint"];

    [animation setDuration:1.f];

    [animation setFromValue:[NSValue valueWithCGPoint:CGPointMake(0.0,0)]];

    [animation setToValue:[NSValue valueWithCGPoint:CGPointMake(1.0,0)]];

    [animation setRemovedOnCompletion:NO];

    [myGradient addAnimation: animation forKey:@"startPoint"];

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Creating a gradient alpha mask

UIImageView * view = [[UIImageView alloc] initWithImage:image];

// Make a gradient

CAGradientLayer * myGradient = [CAGradientLayer layer];

//Choose colors

UIColor * color1 = [UIColor ...];

UIColor * color2 = [UIColor ...];

[myGradient setCOlors:{NSArray arrayWithObjects:(id)[color1 CGColor], (id)[color2 CGColor], nil]];

// apply as mask

view.layer.mask = myGradient;

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Convert a CGPoint to be used in CALayer animations

[animation setToValue:[NSValue valueWithCGPoint:CGPointMake(0.2,0)]];

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Creating CGRect from CGPoint and CGSize:

CGRect rect = (CGRect){CGPointZero, CGSizeZero};

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Debugging CG structures

CGPoint myPoint;

...

NSLog(@"%@", CGPointFromString(myPoint));

Also:

CGRectFromString(myRect);

CGSizeFromString(mySize);