bjhomer

NSMutableArray *a = [NSMutableArray array];
[a addObject:a];
NSLog(@"a: %@", a);

bjhomer

#! /usr/local/bin/macruby

framework "ScriptingBridge"

iTunes = SBApplication.applicationWithBundleIdentifier("com.apple.iTunes")

iTunes.currentTrack.name

bjhomer

// This is a useful bit of code for waiting for the results of an
// asynchronous operation. It's especially useful in unit tests.
// It keeps the run loop going, so it's not blocking delegate callbacks.

BOOL waitForBlock(NSTimeInterval timeout,
                         BOOL (^condition)(void)) {
    NSDate *timeoutDate = [NSDate dateWithTimeIntervalSinceNow:timeout];
    BOOL val = condition();
    while ( val == NO && [timeoutDate timeIntervalSinceNow] > 0 ) { 
        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:timeoutDate];

bjhomer

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{

    @autoreleasepool {
        __block int x;
            
        NSLog(@"Address of x outside of block: %p", &x);

bjhomer

@implementation UITableView (in_updateInBlocks)

- (void)updateWithBlock:(void (^)(void))block {
    [self beginUpdates];
    block();
    [self endUpdates];
}

@end

bjhomer

NSString *a = [NSString stringWithFormat:@"hi %@", @"there"];

NSMutableString *b = [NSMutableString stringWithString:@"hi"];
[b appendString:@" there"];
		
NSLog(@"[a isEqual:b]:  %d", [a isEqual:b]); // 1
NSLog(@"[b isEqual:b]:  %d", [b isEqual:a]); // 1

bjhomer

#import <objc/runtime.h>
#import <UIKit/UIKit.h>

@interface UIWebView (HackishAccessoryHiding)
@property (nonatomic, assign) BOOL hackishlyHidesInputAccessoryView;
@end

@implementation UIWebView (HackishAccessoryHiding)

static const char * const hackishFixClassName = "UIWebBrowserViewMinusAccessoryView";

bjhomer

- (void)setFoo:(BOOL)foo animated:(BOOL)animated {
    [super setFoo:foo animated:animated];

    dispatch_block_t changes = ^{
        if (foo) {
            someView.alpha = 1.0;
        }
        else {
            someView.alpha = 0.0;
        }

bjhomer

NSManagedObjectContext *backgroundContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];

NSManagedObjectContext *mainQueueContext  = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];

mainQueueContext.parentContext = backgroundContext;

[backgroundContext performBlock:^{
    id someManagedObject = [backgroundContext objectWithID:someID];
    
    // Ensure that the object is not a fault

bjhomer

Running echo "*.m diff=objc" >> .gitattributes in a git repo tells git to use the obj-c diff algorithm when running git diff. For the most part, this isn't much different from the standard diff algorithm. However, it adds one key benefit.

In a unified git diff, added lines are prefixed with a +, and removed lines are prefixed with a -. Unchanged lines are provided for context, and have no prefix. As added context, though, unified diffs have a @@-prefixed line at the beginning of each hunk. Minimally, the @@ lines specify which lines in the file are being changed. It can also contain a label, if git can determine an appropriate label for that section of code.

By default, the label on a hunk context line is the name of the enclosing C function. That works great for C-ish code, but completely misses Obj-C method signatures. As a result, when diffing Obj-C files, the context label is either empty, or falls back to the last C-ish declaration it could find. This is usually entirely useless.

Adding