nsdictionary

I'm trying to write an NSDictionary to a plist but when I open the plist no data has been written to it. From the log my path looks correct and my code is pretty standard. Any ideas? NSArray *keys = [NSArray arrayWithObjects:@"key1", @"key2", @"key3", nil]; NSArray *objects = [NSArray arrayWithObjects:@"value1", @"value2", @"value3", nil]; NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys]; for (id key in dictionary) { NSLog(@"key: %@, value: %@", key, [dictionary objectForKey:key]); } NSString *path = [[NSBundle mainBundle] pathForResource:@"FormData" ofType:

I am using the code found in this post: Mulitple Arrays From Plist , with the same plist formatting. This works successfully, however I do not know how to save the created arrays back into a plist, in the same format. How would I achieve this? EDIT: It is not so much the saving that I need, but the forming of the data to save. The plist is an array of dictionaries with strings and their corresponding keys. All the strings with a certain key are put into an array of their own. How would I put that array back into the correct positions in the array of dictionaries, ready to save? Jhaliya Don't

Can I sort the NSDictionary on basis of key? Max Seelemann You can sort the keys and then create an NSMutableArray by iterating over them. NSArray *sortedKeys = [[dict allKeys] sortedArrayUsingSelector: @selector(compare:)]; NSMutableArray *sortedValues = [NSMutableArray array]; for (NSString *key in sortedKeys) [sortedValues addObject: [dict objectForKey: key]]; It is much simpler to use objectsForKeys:notFoundMarker: for that NSDictionary *yourDictionary; NSArray *sortedKeys = [yourDictionary.allKeys sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"self" ascending:YES]

I have an NSMutableDictionary with integer values, and I'd like to get an array of the keys, sorted ascending by their respective values. For example, with this dictionary: mutableDict = { "A" = 2, "B" = 4, "C" = 3, "D" = 1, } I'd like to end up with the array ["D", "A", "C", "B"] . My real dictionary is much larger than just four items, of course. Hermann Klecker The NSDictionary Method keysSortedByValueUsingComparator: should do the trick. You just need a method returning an NSComparisonResult that compares the object's values. Your Dictionary is NSMutableDictionary * myDict; And your Array

I have an NSArray which contains NSDictionary objects. Each of these NSDictionary objects contains an ORDER key. How can I sort this NSArray based on this key within each of these NSDictionaries ? Here is an example. Imagines you have an array of dictionnaries. Ecah dictionnary have 2 keys "name" & "dateOfBirth". You can sort your array by "name" like this : // // Sort array by name // NSSortDescriptor *Sorter = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES]; [myArray sortUsingDescriptors:[NSArray arrayWithObject:Sorter]]; [Sorter release]; Note that myArray is a NSMutableArray .

1. 常见问题 　　a,为什么创建的UIButton 点击不了，没有反应？ 　　 原因可能是：UIView 在initWithFrame时候没有小了，超出UIWindow 区域。 b, presentModalViewController动画效果 　　 modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; 　　[self dismissModalViewControllerAnimated:YES]; c, 为什么NSDictionary的键值总是null 　　　初始化数字的时候最好不要直接赋值，要像这样[NSNumber numberWithInt:0 ] d, loadView为什么会不停的执行(循环) 　　 如下： 　　 - ( void )loadView { HelloView *helloView=[[[HelloView alloc] init]autorelease]; [helloView setNeedsDisplay]; [self.view addSubview:helloView]; } 是因为缺少 [super loadView]; 正确的是 - ( void )loadView { [super loadView]; HelloView *helloView=[[[HelloView