nsmutablearray

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a problem here. Or Maybe I'm really tired... I have a class : @interface THECLASS : UIViewController { NSMutableArray* param; } @property(nonatomic, retain) NSMutableArray* param; Inside that class I have a method that is called when the user clicks on a UISwitch inside a tableViewCell (I build the params into a IBAction method that is not shwon here) : @synthesize param; - (void) changedSelectorValue:(NSIndexPath*)indexPath isOn:(BOOL)isOn { [self.param addObject:@"eeeee"]; } This crashes the app with the following log : 2011-02-04

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Below is my code. NSMutableArray *arr = [[NSMutableArray alloc] init]; [arr addObject:@"5"]; [arr addObject:@"7"]; [arr addObject:@"8"]; [arr enumerateObjectsUsingBlock:^(NSString *obj,NSUInteger idx,BOOL *stop) { [arr replaceObjectAtIndex:idx withObject:@"10"]; }]; The Exception log I got *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection was mutated while being enumerated.' *** First throw call stack: (0x1596012 0x12a3e7e 0x161ecc5 0x158fe1b 0x158fa16 0x158f925 0x2ba4 0x1e87b7 0x1e8da7 0x1e9fab

I'm hoping this isn't something to do with the fact that I'm using a Mutable array here, but this one is baffling me so it wouldn't surprise me if that were the case. BACKGROUND: I have made a small database which is essentially an NSMutableArray containing custom objects, which we can call recordObjects. I set up the array: database = [[NSMutableArray alloc] init]; and my custom object, called "recordObject" contains the following variables and inits: NSString *name; int anInt; Bool aBool; I also synthesized methods so I can make calls like: aString = [[database objectAtIndex:someIndex] name]

i tried doing this: Values = [[NSSet setWithArray:Values] allObjects]; and no sucess, Thanks kennytm Your method should work, except it returns an NSArray instead of NSMutableArray . You could use [values setArray:[[NSSet setWithArray:values] allObjects]]; to set values to the content of the new array. Sander Note that the NSSet method may remove any order you have in your NSArray . You might want to loop thru your array to keep the order. Something like this: NSMutableArray* uniqueValues = [[NSMutableArray alloc] init]; for(id e in Values) { if(![uniqueValues containsObject:e]) {

I have a UITableView displaying a list of Cities. I want to separate them by State. I can't seem to figure out how to get it to pick the right items out of my Array. If Section 1 (Arizona) has 2 Cities and Section 2 (California) has 2 Cities, during cellForRowAtIndexPath, Section 2, City 1 has an index of 0, even though it's the 3rd item in my array. I thought about just turning my City Array into a State Array, where each item holds an Array of Cities, but I still don't know what section I'm on and therefore don't know which City Array under the States Array I would need to access. Yannick

I have an NSMutableArray that I'm trying to store and access some structs. How do I do this? 'addObject' gives me an error saying "Incompatible type for argument 1 of addObject". Here is an example ('in' is a NSFileHandle, 'array' is the NSMutableArray): //Write points for(int i=0; i<5; i++) { struct Point p; buff = [in readDataOfLength:1]; [buff getBytes:&(p.x) length:sizeof(p.x)]; [array addObject:p]; } //Read points for(int i=0; i<5; i++) { struct Point p = [array objectAtIndex:i]; NSLog(@"%i", p.x); } As mentioned, NSValue can wrap a plain struct using +value:withObjCType: or