English 中文(简体)
将一阵列划为一间暗中、NSNumber或NSUInteger 未能成功
原标题:Assigning an arrays count to an int, NSNumber or NSUInteger fails

把一只 in子、NSNumber和NSUInteger转让给一阵列,失败......

这是我的法典。

 int diamondCount = [diamonds count];

钻石为微粒

我建了这 app,并扔了一台EXC_BAD_。 ACESS on this line

因此,我检查了国家航空航天局的计算方法,发现该计算方法回收了一种 n。

因此:

     NSUInteger diamondCount = [diamonds count]; 

至今仍向我递交EXC_BAD_ACCESS 因此,在最后一种情况下,它被分配到一定数目的避风港。 With Integer:

它仍在坠毁......任何想法?

最佳回答

无真实(有效)的NSArray。 检查其初始化。

问题回答

Try this:

NSArray *myArray;
NSDate *aDate = [NSDate distantFuture];
NSValue *aValue = [NSNumber numberWithInt:5];
NSString *aString = @"a string";

myArray = [NSArray arrayWithObjects:aDate, aValue, aString, nil];
int i = [myArray count];
NSLog(@"%d",i);
NSInteger j = [myArray count];
NSLog(@"%d",j);
NSNumber *k = [myArray count];
NSLog(@"%d",k);
/*output
2011-11-21 17:01:48.272 test[48840:1303] 3
2011-11-21 17:01:48.272 test[48840:1303] 3
2011-11-21 17:01:48.273 test[48840:1303] 3*/




相关问题
Asynchronous request to the server from background thread

I ve got the problem when I tried to do asynchronous requests to server from background thread. I ve never got results of those requests. Simple example which shows the problem: @protocol ...

objective-c: Calling a void function from another controller

i have a void, like -(void) doSomething in a specific controller. i can call it in this controller via [self doSomething], but i don t know how to call this void from another .m file. I want to call ...

ABPersonViewController Usage for displaying contact

Created a View based Project and added a contact to the AddressBook using ABAddressBookRef,ABRecordRef now i wanted to display the added contact ABPersonViewController is the method but how to use in ...

NSArray s, Primitive types and Boxing Oh My!

I m pretty new to the Objective-C world and I have a long history with .net/C# so naturally I m inclined to use my C# wits. Now here s the question: I feel really inclined to create some type of ...

NSUndoManager and runModalForWindow:

I have a simple Core Data app which displays a list of entities in the main window. To create or add new entities, I use a second modal window with a separate managed object context so changes can be ...

NSMutableArray values becoming "invalid"

I m trying to show a database information in a tableview and then the detailed information in a view my problem is as follow: I created a NSMutableArray: NSMutableArray *myArray = [[NSMutableArray ...

iPhone numberpad with decimal point

I am writing an iPhone application which requires the user to enter several values that may contain a decimal point (currency values, percentages etc.). The number of decimal places in the values ...

热门标签