滚动时 UITableView 损坏

Question

我试图让 UITableView 显示包含在数组中的项目。 该数组包含在一个类 (HX_ParkingSearch) 中。

我有一个包含应用程序委托类中的数组的此类的引用，以使视图能够访问它。 问题是我在表格视图中正确显示一页结果 但是当我尝试向下滚动时，尝试访问数组中的下一项时会发生异常。 事实证明，当我向下滚动并触发 cellForRowAtIndexPath 方法时， 数组中的项目无效并且似乎已被释放但我不明白在哪里 他们正在被释放！

有没有人有任何想法，因为这真的让我很头疼！

非常感谢， 克里斯。

// 自定义表格视图单元格的外观。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";
    HX_ParkingLocation *location;
    bookingApp2AppDelegate *del  = (bookingApp2AppDelegate *) [[UIApplication sharedApplication] delegate];   


    NSMutableArray* array = [del.parkingSearch locations];

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


    location = (HX_ParkingLocation*) [array objectAtIndex: [indexPath row] ];




    return cell;
}




#import <Foundation/Foundation.h>


@interface HX_ParkingLocation : NSObject
{


    NSString *name;


}


@property(retain,nonatomic) NSString* name;


/*
 Initialises this Location instance by passing in the name and code of the location and the URL of the webapi product endpoint.
 The URL is used to find available products at this location.
 */
-(id) initWithName: (NSString*) n;

@end


#import <Foundation/Foundation.h>


@interface HX_ParkingSearch : NSObject 
{
    NSMutableArray* locations;

}
@property (retain) NSMutableArray* locations;


-(BOOL) loadLocations;

@end


#import "HX_ParkingSearch.h"
#import "HX_Parking_Location.h"



@implementation HX_ParkingSearch
@synthesize locations;

//Finds the locations
-(BOOL) loadLocations
{   


    [locations release];
    //Create array to hold locations
    locations = [[NSMutableArray alloc] initWithCapacity:30];

    //Loop through all returned locations
    for(int i=0;i<15;i++)
    {
        //Get location name
        NSString* n = [NSString stringWithFormat:@"Item #%i",i ];



        //Create location instance, which retrieves availability and product information and stores the information in location object.
        HX_ParkingLocation* location = [[HX_ParkingLocation alloc] initWithName:n];
        //add to array
        [locations addObject:location];




    }


    return YES;

}



@end



#import <UIKit/UIKit.h>
#import "HX_ParkingSearch.h"

@interface bookingApp2AppDelegate : NSObject <UIApplicationDelegate> {

    UIWindow *window;
    UINavigationController *navigationController;
     HX_ParkingSearch *parkingSearch;

}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
@property (retain) HX_ParkingSearch *parkingSearch;


@end

@implementation bookingApp2AppDelegate

@synthesize window;
@synthesize navigationController;
@synthesize parkingSearch;


- (void)applicationDidFinishLaunching:(UIApplication *)application 
{


    //Create new parking search instance by specifying the endpoint urls
    HX_ParkingSearch* search = [[HX_ParkingSearch alloc] init];
    [search loadLocations];

    parkingSearch = search;
    //NSLog(@"Search Retain count = %i" ,[search retainCount]);




    [window addSubview:[navigationController view]];
    //[window addSubview:[navigationController initWithNibName:@"VC_Locations" bundle:[NSBundle mainBundle]]];
    [window makeKeyAndVisible];

}

Answer 1

您是否有理由在 loadLocations 中初始化容量为 30 的数组，但只插入 15 个项目？

Answer 2

这个方法对你的数据源有什么作用？：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

还有：

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

tableview 可能只是试图获取超出位置范围的索引