UIPickerView崩溃

Question

我不明白为什么在下面的代码中有一个损坏。我在很大程度上从示例中提升了现有的“实现”。尽管如此，当我尝试更改picker控制器的值时，代码崩溃，因为cloudProviders指向一些随机内存。请给我建议。

//  SettingsViewController.h

#import <UIKit/UIKit.h>

@interface SettingsViewController : UIViewController
    <UIPickerViewDelegate, UIPickerViewDataSource>

@property (retain, nonatomic) IBOutlet UIPickerView *picker;
@property (retain, nonatomic) NSArray *cloudProviders;

@end

//  SettingsViewController.m

#import "SettingsViewController.h"

@interface SettingsViewController ()

@end

@implementation SettingsViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    _cloudProviders = @[@"BOX", @"Yandex", @"Other"];
    NSLog(@"Executing viewDidLoad");
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

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

#pragma mark -
#pragma mark PickerView DataSource
- (NSInteger)numberOfComponentsInPickerView:
(UIPickerView *)pickerView
{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{
    return _cloudProviders.count;
}

- (NSString *)pickerView:(UIPickerView *)pickerView
        titleForRow:(NSInteger)row
        forComponent:(NSInteger)component
{
    return _cloudProviders[row];
}

#pragma mark -
#pragma mark PickerView Delegate
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
      inComponent:(NSInteger)component
{
    NSLog(@"Executing didSelectRow");
}

/*
-(IBAction)textFieldReturn:(id)sender
{
    [sender resignFirstResponder];
}
 */
@end

另外，人们使用什么工具来追踪iOS上的内存泄漏之类的情况？有什么可以告诉我是谁修改了我的指针吗？

谢谢

Answer 1

安娜是对的。将该属性设置为self.cloudProviders可以解决此问题。