好的,我完全被这里难过了。
这适用于CouponListViewController.m:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.couponList = [CouponDatabase database].couponList;
self.title = @"Coupon List";
}
这适用于CouponDetailViewController.m:
- (void)viewWillAppear:(BOOL)animated {
CouponDetails *details = [[CouponDatabase database] couponDetails:_uniqueId];
if (details != nil) {
[_merchantNameLabel setText:details.merchantName];
[_longDealLine1Label setText:details.longDealLine1];
//....blah...blah//
}
}
但是,当我从这里更改CouponDatabase.h(适用于上述内容)时:
@class CouponDetails;
@interface CouponDatabase : NSObject {
sqlite3 *_database;
}
+ (CouponDatabase *)database;
- (NSArray *)couponList;
- (CouponDetails *)couponDetails:(int) uniqueId;
...到此(如果我在方法中手动设置'selectedCategory'的值,则有效):
@class CouponList;
@class CouponDetails;
@interface CouponDatabase : NSObject {
sqlite3 *_database;
}
+ (CouponDatabase *)database;
- (CouponList *)couponList:(int) selectedCategory;
- (CouponDetails *)couponDetails:(int) uniqueId;
然后将CouponListViewController.m更改为:
1 - (void)viewWillAppear:(BOOL)animated {
2 [super viewWillAppear:animated];
3 self.couponList = [[CouponDatabase database] couponList:_selectedCategory];
4 self.title = @"Coupon List";
5 }
我在上面第3行收到此错误:
warning: incompatible Objective-C types 'struct CouponList *',
expected 'struct NSArray *' when passing argument 1 of 'setCouponList:'
from distinct Objective-C type
问题:'self.couponlist'行的正确格式是什么,以便我可以将整数传递给CouponDatabase以在couponList方法中使用?
编辑:我知道couponDetails现在是一个类而不是数组 - 我只是不知道如何格式化行以初始化表数据。我希望这是有道理的 - 对此的任何帮助都将非常感激。
提前致谢!
添加CouponListViewController.h:
#import <UIKit/UIKit.h>
@class CouponDetailsViewController;
@interface CouponListViewController : UITableViewController {
NSArray *_couponList;
CouponDetailsViewController *_couponDetails;
int _selectedCategory;
}
@property (nonatomic, retain) NSArray *couponList;
@property (nonatomic, retain) CouponDetailsViewController *couponDetails;
@property(nonatomic, assign) int selectedCategory;
@end
答案 0 :(得分:0)
尝试将CouponListViewController.h更改为:
#import <UIKit/UIKit.h>
@class CouponDetailsViewController;
@interface CouponListViewController : UITableViewController {
CouponList *_couponList;
CouponDetailsViewController *_couponDetails;
int _selectedCategory;
}
@property (nonatomic, retain) CouponList *couponList;
@property (nonatomic, retain) CouponDetailsViewController *couponDetails;
@property(nonatomic, assign) int selectedCategory;
@end
哎呀我把我的回复放在我自己的原帖中,应该把它放在这里:
编辑:好的,我按照罗伯特的建议对CouponListViewController.h进行了更改,并添加了 @class CouponList; ,如下所示:
#import <UIKit/UIKit.h>
@class CouponList;
@class CouponDetailsViewController;
@interface CouponListViewController : UITableViewController {
CouponList *_couponList;
CouponDetailsViewController *_couponDetails;
int _selectedCategory;
}
@property (nonatomic, retain) CouponList *couponList;
@property (nonatomic, retain) CouponDetailsViewController *couponDetails;
@property(nonatomic, assign) int selectedCategory;
@end
我仍然在CouponListViewController.m中遇到错误:
#import "CouponListViewController.h"
#import "CouponDatabase.h"
#import "CouponList.h"
#import "CouponDetailsViewController.h"
@implementation CouponListViewController
@synthesize couponList = _couponList;
@synthesize couponDetails = _couponDetails;
@synthesize selectedCategory = _selectedCategory;
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.couponList = [CouponDatabase database].couponList; // <--- ERROR 1
self.title = @"Coupon List";
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [_couponList count]; // <--- WARNINGS 1 AND 2
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (self.couponDetails == nil) {
self.couponDetails = [[[CouponDetailsViewController alloc] initWithNibName:@"CouponDetailsViewController" bundle:nil] autorelease];
}
CouponList *info = [_couponList objectAtIndex:indexPath.row]; // <--- WARNING 3
NSLog(@"%@", info.uniqueId);
_couponDetails.uniqueId = info.uniqueId;
[self.navigationController pushViewController:_couponDetails animated:YES];
}
错误1:在非结构或联合的情况下请求成员'couponList'
警告1:'CouponList'可能无法响应'-count'
警告2:return从没有强制转换的指针生成整数
警告3:'CouponList'可能无法响应'-objectAtIndex:'
答案 1 :(得分:0)
在CouponDatabase的原始代码中,您要更改定义:
- (NSArray *)couponList;
这个:
- (CouponList *)couponList:(int) selectedCategory;
然而,您将该返回值用作列表视图控制器的数据源,因此。在这里你应该修复不匹配。如何解决它取决于您的应用程序的语义。您尝试使用- (CouponList *)couponList:(int) selectedCategory;
做什么?真正归还这个选择器的是什么?接口CouponList
是什么?可能你应该改变这一行:
self.couponList = [[CouponDatabase database] couponList:_selectedCategory];
以便它从CouponList
返回NSArray构建。但我不确定你的对象的语义,所以情况可能并非如此。