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The difference between Classes, Objects, and Instances
...cribes the object (instance) word.
When a class is declared, no memory is allocated so class is just a template.
When the object of the class is declared, memory is allocated.
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UIImagePickerController breaks status bar appearance
...olution:
UIImagePickerController* imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
and
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
[[UIApplica...
Is there any overhead to declaring a variable within a loop? (C++)
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Stack space for local variables is usually allocated in function scope. So no stack pointer adjustment happens inside the loop, just assigning 4 to var. Therefore these two snippets have the same overhead.
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How can I convert NSDictionary to NSData and vice versa?
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NSDictionary -> NSData:
NSMutableData *data = [[NSMutableData alloc] init];
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[archiver encodeObject:yourDictionary forKey:@"Some Key Value"];
[archiver finishEncoding];
[archiver release];
// Here,...
How can I use Autolayout to set constraints on my UIScrollview?
...m sure you are aware):
UIView *containerView = [[UIView alloc] init];
UIScrollView *scrollView = [[UIScrollView alloc] init];
[containerView addSubview:scrollView];
containerView.translatesAutoresizingMaskIntoConstraints = NO;
scrollView.translatesAutore...
How to remove elements from a generic list while iterating over it?
...Int % 2 == 0) { test.Remove(myInt); } } You still have to allocate a copy for Reverse and it introduces Huh? moment - why is there Reverse.
– jahav
May 25 '15 at 13:38
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Correct way to load a Nib for a UIView subclass
... want to load your CustomView, use the following line of code
[[CustomView alloc] init];
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Most efficient way to remove special characters from string
... @SILENT: No, it doesn't, but you should only do that once. If you allocate an array that large each time you call the method (and if you call the method frequently) then the method becomes the slowest by far, and causes a lot of work for the garbage collector.
– Guffa
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How to efficiently concatenate strings in go
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If you know the total length of the string that you're going to preallocate then the most efficient way to concatenate strings may be using the builtin function copy. If you don't know the total length before hand, do not use copy, and read the other answers instead.
In my tests, that approa...
What's the best way to communicate between view controllers?
...tionDidFinishLoading {
MyBookWarehouse *myWarehouse = [[MyBookWarehouse alloc]init];
MyCheckoutController *myCheckout = [[MyCheckoutController alloc]init];
BookPickerViewController *bookPicker = [[BookPickerViewController alloc]
initWithWarehouse:m...