Question

我尝试运行以下代码，作为概念验证，我收到以下错误：

  *** -[UIAnimator count]: unrecognized selector sent to instance 0x3832610
  2009-10-09 00:33:22.355 Concept1[680:207] *** Terminating app due to uncaught exception
 'NSInvalidArgumentException', reason: '*** -[UIAnimator count]: unrecognized selector sent to
  instance 0x3832610'

这个异常似乎是指我之前定义为NSArray的变量（即变量'keys'）所以我很困惑为什么它现在似乎已经变成了UIAnimator。我无法在UIAnimator上找到任何文档也令人沮丧。

注释掉用于在viewDidLoad方法中分配给'keys'的临时数组的释放使得代码运行但是我无法理解为什么...不会释放'array'导致a泄漏，因为这个对象拥有它？

我会非常感激任何人可以提供的任何帮助，因为它是凌晨1点，而且我已经完成了关于可能导致这种行为的想法。

无论如何，这是代码：

#import "MyViewController.h"


@implementation MyViewController

@synthesize names;
@synthesize keys;

/*
- (id)initWithStyle:(UITableViewStyle)style {
    // Override initWithStyle: if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
    if (self = [super initWithStyle:style]) {
    }
    return self;
}
*/


- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"My Details";

    NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:@"David", @"First Name", @"Johnson", @"Last Name", nil];

    self.names = dic;

    [dic release];

    NSArray *array = [[names allKeys] sortedArrayUsingSelector:@selector(compare:)];


    self.keys = array;


    [array release]; //if this is commented out then the code works. why? won't this leak?

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}


- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
    self.names = nil;
    self.keys = nil;
}


#pragma mark Table view methods

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}


// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return [keys count];
}


// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    NSInteger row = [indexPath row];

    static NSString *CellIdentifier = @"Cell";

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

    // Set up the cell...
    cell.textLabel.text = [names objectForKey:[keys objectAtIndex:row]];
    return cell;
}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Navigation logic may go here. Create and push another view controller.
    // AnotherViewController *anotherViewController = [[AnotherViewController alloc] initWithNibName:@"AnotherView" bundle:nil];
    // [self.navigationController pushViewController:anotherViewController];
    // [anotherViewController release];
}



- (void)dealloc {
    [names release];
    [keys release];
    [super dealloc];
}


@end

Answer 1

您不拥有sortedArrayUsingSelector:的结果，因此您不得发布它。该版本取消了您通过self.keys = array获得的所有权，这意味着阵列可以消失。

查看Apple的memory management rules了解更多信息。

NSArray引发异常，说明是（UIAnimator *）

1 个答案: