我试图让 UITableView 显示数组中包含的项目。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 tableview 中正确显示了一页结果，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，但我不明白它们被释放的位置！
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];
}