将NSMutablearray复制到另一个 [英] Copy NSMutablearray to another

问题描述

I am trying to copy NSMutableArray to another but it does not show me anything at the UITableView:

NSMutableArray *objectsToAdd= [[NSMutableArray alloc] initWithObjects:@"one",@"two"];

NSMutableArray *myArray = [[NSMutableArray alloc] initWithObjects:objectsToAdd,nil];

NSMutableArray *list = [[NSMutableArray alloc] init];

[self.list addObjectsFromArray:myArray];

没有出现！什么是错误？

Nothing show up! What is wrong?

它会崩溃我的应用程序，因为我没有nil在 NSMutableArray 如何添加nil到它？ addobject：nil 不工作会导致应用程式崩溃：

It crashes my app because I do not have nil at my NSMutableArray how can I add nil to it? addobject:nil does not work it crashes the app:

static NSString * DisclosureButtonCellIdentifier = 
@"DisclosureButtonCellIdentifier";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: 
                         DisclosureButtonCellIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault 
                                   reuseIdentifier: DisclosureButtonCellIdentifier]
            autorelease];
}
NSUInteger row = [indexPath row];

NSString *rowString =nil;

rowString = [list objectAtIndex:row];


cell.textLabel.text = rowString;

cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
[rowString release];
return cell;

推荐答案

分配NSMutableArray的初始调用很可能会崩溃，因为你的参数列表中没有nil终止符。

Your initial call to alloc an NSMutableArray will most likely crash, since you don't have a nil terminator in your argument list.

此外，还有一个局部变量，列表和一个属性列表。确保你实例化你认为你是什么。您可能需要这样做：

Also, you have a local variable, list, and a property, list. Make sure you're instantiating what you think you are. You might need to do this:

NSMutableArray *objectsToAdd= [[NSMutableArray alloc] initWithObjects:@"one",@"two", nil];

NSMutableArray *myArray = [[NSMutableArray alloc] initWithObjects:objectsToAdd,nil];

self.list = [[NSMutableArray alloc] init];

[self.list addObjectsFromArray:myArray];

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