krzysztofzablocki

#import <Foundation/Foundation.h>
 
@interface A : NSObject
- (void)doThingWithObject:(id)o completion:(void(^)(void))completionHandler;
@end
 
@implementation A
- (void)doThingWithObject:(id)o completion:(void(^)(void))completionHandler
{
  NSLog(@"object: %@", o);

krzysztofzablocki

Wrong:
__weak id obj;
dispatch_async(queue, ^() {
[obj doSomething];
[obj doSomethingElse]; <- can turn to nil at any point, should store in strong at beggining of block
[obj doSomethingElse2];
});

Ok:

krzysztofzablocki

With 10.8 SDK, `#define OBJC_OLD_DISPATCH_PROTOTYPES 0` at the top of your file or PCH to get errors if you use objc_msgSend without a cast.

krzysztofzablocki

typedef NS_ENUM(NSInteger, kErrorCode) {
  kErrorCodeInternal = 431432,
};
 
//! generate error and log it.
extern NSError *pixle_NSErrorMake(NSString *message, NSUInteger code, NSDictionary *aUserInfo, SEL selector);
 
#define AssertTrueOrReturnBlock(condition, block) do{ NSAssert((condition), @"Invalid condition not satisfying: %s", #condition);\
    if(!(condition)) { block(pixle_NSErrorMake([NSString stringWithFormat:@"Invalid condition not satisfying: %s", #condition], kErrorCodeInternal, nil, _cmd)); return;} }while(0)
 

krzysztofzablocki

#define SafeCall(arg, methodToCall) (arg !=[NSNull null]) ? [arg methodToCall] : nil
 
    int optionalValue = SafeCall([response valueForKey:@"number"], intValue);

krzysztofzablocki

        [UIView transitionWithView:cell.imageView duration:0.25f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
          cell.imageView.image = decompressedThumbnail;
        }               completion:nil];

krzysztofzablocki

//! for gesture recognizer support in cocos2d use https://github.com/krzysztofzablocki/CCNode-SFGestureRecognizers
- (void)handlePanGesture:(UIPanGestureRecognizer*)gestureRecognizer
{
    CGPoint location = [[CCDirector sharedDirector] convertToGL:[gestureRecognizer locationInView:gestureRecognizer.view]];
    static CGPoint oldLocation;
    
    //! this will make sure that oldLocation is initialized
    if (gestureRecognizer.state != UIGestureRecognizerStateBegan) {
        //! we need to calculate angle difference between previous position and current one in regards to dial center
        CGPoint firstDir = ccpSub(oldLocation, dial.position);

krzysztofzablocki

- (void)dealloc {
   [percentGender release];
   [percentHisto release];
   [percentPS release];
   [percentSmoke release];
   [percentGender dealloc];
   [percentHisto dealloc];
   [percentPS dealloc];
   [percentSmoke dealloc];
   percentGender = nil;

krzysztofzablocki

    CGContextRef bitmapContext = CGBitmapContextCreate(NULL,
                                                       rect.size.width,
                                                       rect.size.height,
                                                       CGImageGetBitsPerComponent(imageRef),
                                                       CGImageGetBytesPerRow(imageRef),
                                                       CGImageGetColorSpace(imageRef),
                                                       kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little);

krzysztofzablocki

@import UIKit;

@interface UINavigationItem (KZAdditions)

@property (nonatomic, copy) NSDictionary *kz_titleTextAttributes;

@end