當我運行下面的代碼時,我從Parse.com數據庫中獲取數據,但是當我嘗試打印出試圖存儲此數據的數組時,它會發出一個空值。幫幫我!無法將解析對象添加到NSMutableArray
PFQuery *query = [PFQuery queryWithClassName:@"Resolution"];
[query whereKey:@"event" equalTo:event_name_label.text];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
for (PFObject *object in objects) {
[resolution_names addObject:(NSString*)[object objectForKey:@"resolution_name"]];
NSLog(@"%@", [object objectForKey:@"resolution_name"]);
}
NSLog(@"%@", resolution_names);
} else {
NSLog(@"Error: %@ %@", error, [error userInfo]);
}
}];
我已經正確地宣佈(我認爲)NSMutableArray resolution_names,但它在記錄它時返回null。
這裏是我的頭文件:
#import <UIKit/UIKit.h>
@interface MenuViewController : UIViewController {
IBOutlet UILabel *event_name_label;
NSString *event_id;
NSString *event_name;
NSMutableArray *resolution_names;
NSMutableArray *resolution_pro_speakers;
NSMutableArray *resolution_con_speakers;
NSMutableArray *resolution_results;
NSMutableArray *billtrackertablevalues;
}
@property (nonatomic, retain) IBOutlet UILabel *event_name_label;
@property (nonatomic) NSString *event_id;
@property (nonatomic) NSString *event_name;
@property (nonatomic) NSMutableArray *resolution_names;
@property (nonatomic) NSMutableArray *resolution_pro_speakers;
@property (nonatomic) NSMutableArray *resolution_con_speakers;
@property (nonatomic) NSMutableArray *resolution_results;
@property (nonatomic) NSMutableArray *billtrackertablevalues;
@end
再一次,我能看到的值[對象objectForKey:@「resolution_name」]在控制檯,但是當我嘗試輸出的值NSMutableArray resolution_names,它只是在控制檯上顯示「(null)」。
默認情況下屬性很強。 –