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How to Deal with Temporary NSManagedObject instances?
...ectContext:myMOC];
NSManagedObject *unassociatedObject = [[NSManagedObject alloc] initWithEntity:entity insertIntoManagedObjectContext:nil];
Then when you want to save it:
[myMOC insertObject:unassociatedObject];
NSError *error = nil;
if (![myMoc save:&error]) {
//Respond to the error
}
...
How can I change the color of pagination dots of UIPageControl?
... f = CGRectMake(0, 0, 320, 20);
PageControl *pageControl = [[[PageControl alloc] initWithFrame:f] autorelease];
pageControl.numberOfPages = 10;
pageControl.currentPage = 5;
pageControl.delegate = self;
[self addSubview:pageControl];
Header file:
//
// PageControl.h
//
// Replacement for UIPage...
Pull to refresh UITableView without UITableViewController
...able view.
Same as in the case of collection view. Just replace table view alloc with collection view.
UITableView *tableViewDemo = [[UITableView alloc]init];
tableViewDemo.frame = CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height);
tableViewDemo.dataSource = self;
tableView...
Custom toast on Android: a simple example
...tch_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:background="#DAAA" >
<ImageView android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginRight="10dp" />
...
Send string to stdin
...73e 0ca6 bb3e D..>bN.>.|.>...>
00000b0: 6fcc bf3e 15ef c33e e90d c83e d728 cc3e o..>...>...>.(.>
00000c0: c93f d03e ac52 d43e 6c61 d83e f36b dc3e .?.>.R.>la.>.k.>
00000d0: 2f72 e03e 0a74 e43e 7171 e83e 506a ec3e /r.>.t.>qq.>Pj.>
00000e0: 945e f03e ...
How do I determine the size of an object in Python?
...the minimum size of the following objects, and note that sets and dicts preallocate space so empty ones don't grow again until after a set amount (which may vary by implementation of the language):
Python 3:
Empty
Bytes type scaling notes
28 int +4 bytes about every 30 powers of ...
Getting image dimensions without reading the entire file
..., 0x61 }, DecodeGif },
{ new byte[]{ 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }, DecodePng },
{ new byte[]{ 0xff, 0xd8 }, DecodeJfif },
};
/// <summary>
/// Gets the dimensions of an image.
/// </summary>
/// <para...
What’s the difference between “Array()” and “[]” while declaring a JavaScript array?
...ray access. There's no control to prove that the browsers are actually pre-allocating the memory (which the specification does not say they must do). If we can assume that array access is constant and the majority of the time will be spent allocating memory in both examples then [] could be prefera...
Programmatically retrieve memory usage on iPhone
...Phone app is using at anytime, programmatically. Yes I'm aware about ObjectAlloc/Leaks. I'm not interested in those, only to know if it's possible to write some code and get the amount of bytes being used and report it via NSLog.
...
Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?
... if (sharedInstance == nil) {
sharedInstance = [[MyClass alloc] init];
}
}
return sharedInstance;
}
The benefit of dispatch_once() over this is that it's faster. It's also semantically cleaner, because it also protects you from multiple threads doing alloc init of...