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Which is a better way to check if an array has more than one element?
...languages. Many programmers expect sizeof() to return the amount of memory allocated.
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How to convert an NSString into an NSNumber
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Use an NSNumberFormatter:
NSNumberFormatter *f = [[NSNumberFormatter alloc] init];
f.numberStyle = NSNumberFormatterDecimalStyle;
NSNumber *myNumber = [f numberFromString:@"42"];
If the string is not a valid number, then myNumber will be nil. If it is a valid number, then you now have all of...
Removing App ID from Developer Connection
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App IDs cannot be removed because once allocated they need to stay alive so that another App ID doesn't accidentally collide with a previously existing App ID.
Apple should however support hiding unwanted App IDs (instead of completely deleting them) to reduce cl...
iOS 7 - Failing to instantiate default view controller
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Using programmatically :
Objective-C :
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *viewController = [storyboard instantiateViewContr...
How to add new elements to an array?
...]"
If you insist on using arrays, you can use java.util.Arrays.copyOf to allocate a bigger array to accomodate the additional element. This is really not the best solution, though.
static <T> T[] append(T[] arr, T element) {
final int N = arr.length;
arr = Arrays.copyOf(arr, N + 1);...
Can Objective-C switch on NSString?
...":
NSString *cardName = ...;
NSNumberFormatter *nf = [[NSNumberFormatter alloc] init];
[nf setNumberStyle:NSNumberFormatterSpellOutStyle];
NSNumber *n = [nf numberFromString:[cardName lowercaseString]];
[self setValue:[n intValue]];
[nf release];
Note that the number formatter wants the string t...
UITapGestureRecognizer breaks UITableView didSelectRowAtIndexPath
... problem is to:
UITapGestureRecognizer *tapRec = [[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(tap:)];
[tapRec setCancelsTouchesInView:NO];
This lets the UIGestureRecognizer recognize the tap and also pass the touch to the next responder. An unintended consequence of ...
UICollectionView spacing margins
...or
UICollectionViewFlowLayout *aFlowLayout = [[UICollectionViewFlowLayout alloc] init];
[aFlowLayout setSectionInset:UIEdgeInsetsMake(top, left, bottom, right)];
Updated for Swift 5
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, inset...
Multidimensional Array [][] vs [,] [duplicate]
...the time of construction, only the first. You specify the second when you allocate each array that is part of the arrays... I'll update and clarify:
– James Michael Hare
Sep 24 '12 at 14:51
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Can I “multiply” a string (in C#)?
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Very sure. It allocates a string (of that length) behind the scenes, then mutates it. It doesn't work like a regular List<T> etc.
– Marc Gravell♦
Feb 10 '09 at 16:05
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