我收到了上述错误并且整天都在看着它，我没有快速到达。任何想法？我是iPhone开发的新手。代码如下：
... WorkoutAppDelegate.h：
#import "WorkoutViewController.h"
@interface WorkoutAppDelegate : NSObject <UIApplicationDelegate> {
NSManagedObjectModel *managedObjectModel;
NSManagedObjectContext *managedObjectContext;
NSPersistentStoreCoordinator *persistentStoreCoordinator;
UIWindow *window;
WorkoutViewController *viewController;
}
- (IBAction)saveAction:sender;
@property (nonatomic, retain, readonly) NSManagedObjectModel *managedObjectModel;
@property (nonatomic, retain, readonly) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, retain, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator;
@property (nonatomic, readonly) NSString *applicationDocumentsDirectory;
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet WorkoutViewController *viewController;
@end
WorkoutAppDelegate.m ....：
#import "WorkoutAppDelegate.h"
@implementation WorkoutAppDelegate
@synthesize window;
@synthesize viewController;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after app launch
viewController.managedObjectContext = [self managedObjectContext];
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
/**
applicationWillTerminate: saves changes in the application's managed object context before the application terminates.
*/
- (void)applicationWillTerminate:(UIApplication *)application {
NSError *error;
if (managedObjectContext != nil) {
if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
// Handle error
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort(); // Fail
}
}
}
/**
Performs the save action for the application, which is to send the save:
message to the application's managed object context.
*/
- (IBAction)saveAction:(id)sender {
NSError *error;
if (![[self managedObjectContext] save:&error]) {
// Handle error
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort(); // Fail
}
}
/**
Returns the managed object context for the application.
If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application.
*/
- (NSManagedObjectContext *) managedObjectContext {
if (managedObjectContext != nil) {
return managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) {
managedObjectContext = [[NSManagedObjectContext alloc] init];
[managedObjectContext setPersistentStoreCoordinator: coordinator];
}
return managedObjectContext;
}
/**
Returns the managed object model for the application.
If the model doesn't already exist, it is created by merging all of the models found in the application bundle.
*/
- (NSManagedObjectModel *)managedObjectModel {
if (managedObjectModel != nil) {
return managedObjectModel;
}
managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];
return managedObjectModel;
}
/**
Returns the persistent store coordinator for the application.
If the coordinator doesn't already exist, it is created and the application's store added to it.
*/
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (persistentStoreCoordinator != nil) {
return persistentStoreCoordinator;
}
NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"WorkoutCoreData.sqlite"]];
NSError *error;
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&error]) {
// Handle error
}
return persistentStoreCoordinator;
}
/**
Returns the path to the application's documents directory.
*/
- (NSString *)applicationDocumentsDirectory {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
return basePath;
}
- (void)dealloc {
[managedObjectContext release];
[managedObjectModel release];
[persistentStoreCoordinator release];
[viewController release];
[window release];
[super dealloc];
}
@end
... WorkoutViewController.h：
#import <UIKit/UIKit.h>
#import "Workout.h"
@protocol CreateWorkoutDelegate <NSObject>
-(void)didCancelWorkout;
-(void)didCreateWorkout:(NSString *)thisRoute
Type:(NSString *)thisType
Distance:(NSString *)thisDistance
Time:(NSString *)thisTime
Message:(NSString *)thisMessage;
@end
@interface WorkoutViewController : UIViewController {
// IBOutlet UIlabel *Speed;
// IBOutlet UIlabel *Calories;
IBOutlet UILabel *DBContents;
IBOutlet UITextField *route;
IBOutlet UITextField *type;
IBOutlet UITextField *distance;
IBOutlet UITextField *time;
IBOutlet UITextField *message;
IBOutlet UIButton *saveWorkout;
IBOutlet UIButton *cancelWorkout;
NSMutableArray *workoutArray;
id workoutDelegate;
Workout *currentWorkout;
NSManagedObjectContext *managedObjectContext;
}
//@property (retain,nonatomic) UILabel *Speed;
//@property (retain,nonatomic) UILabel *Calories;
@property (retain,nonatomic) UILabel *DBContents;
@property (retain,nonatomic) UITextField *route;
@property (retain,nonatomic) UITextField *type;
@property (retain,nonatomic) UITextField *distance;
@property (retain,nonatomic) UITextField *time;
@property (retain,nonatomic) UITextField *message;
@property (retain,nonatomic) NSMutableArray *workoutArray;
//@property (retain,nonatomic) UIButton *saveWorkout;
//@property (retain,nonatomic) UIButton *cancelWorkout;
@property (nonatomic, assign) id<CreateWorkoutDelegate> workoutDelegate;
@property (nonatomic, assign) NSManagedObjectContext *managedObjectContext;
-(IBAction)hideKeyboard;
-(IBAction)saveWorkout;
-(IBAction)cancelWorkout;
@end
... WorkoutViewController.m：
#import "WorkoutViewController.h"
#import "Workout.h"
@implementation WorkoutViewController
@synthesize workoutDelegate;
//@synthesize Speed;
//@synthesize Calories;
@synthesize route;
@synthesize type;
@synthesize distance;
@synthesize time;
@synthesize message;
@synthesize DBContents;
@synthesize workoutArray;
@synthesize managedObjectContext;
//@synthesize saveWorkout;
//@synthesize cancelWorkout;
-(IBAction)hideKeyboard {
}
-(IBAction)saveWorkout {
[workoutDelegate didCreateWorkout: route.text
Type: type.text
Distance: distance.text
Time: time.text
Message: message.text];
}
-(IBAction)cancelWorkout {
[self.workoutDelegate didCancelWorkout];
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
-(void)viewDidLoad {
//Set images for Save & Cancel buttons.
UIImage *normalImage = [[UIImage imageNamed:@"whiteButton.png"]
stretchableImageWithLeftCapWidth:12.0
topCapHeight:0.0];
[saveWorkout setBackgroundImage:normalImage forState:UIControlStateNormal];
[cancelWorkout setBackgroundImage:normalImage forState:UIControlStateNormal];
UIImage *pressedImage = [[UIImage imageNamed:@"blueButton.png"]
stretchableImageWithLeftCapWidth:12.0
topCapHeight:0.0];
[saveWorkout setBackgroundImage:pressedImage forState:UIControlStateHighlighted];
[cancelWorkout setBackgroundImage:pressedImage forState:UIControlStateHighlighted];
//Fetch details from the database.
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Workout" inManagedObjectContext:managedObjectContext];
[request setEntity:entity];
NSError *error;
self.workoutArray = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
[request release];
//self.workoutArray = [[NSMutableArray alloc] init];
//self.DBContents.text = [self.workoutArray objectAtIndex:0];
[super viewDidLoad];
}
-(void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
-(void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
-(void) didCreateWorkout:(NSString *)thisRoute
Type:(NSString *)thisType
Distance:(NSString *)thisDistance
Time:(NSString *)thisTime
Message:(NSString *)thisMessage {
// Add the new workout.
Workout *newWorkout = [NSEntityDescription
insertNewObjectForEntityForName:@"Workout"
inManagedObjectContext:self.managedObjectContext];
newWorkout.route = thisRoute;
newWorkout.type = thisType;
newWorkout.distance = thisDistance;
newWorkout.time = thisTime;
newWorkout.message = thisMessage;
[self.workoutArray addObject:newWorkout];
//[self dismissModalViewControllerAnimated:YES];
}
-(void)didCancelWorkout {
[self dismissModalViewControllerAnimated:YES];
}
-(void)dealloc {
// [Speed release];
// [Calories release];
[route release];
[type release];
[distance release];
[time release];
[message release];
// [saveWorkout release];
// [cancelWorkout release];
[workoutArray release];
[managedObjectContext release];
[super dealloc];
}
@end
我正在尝试保存我在屏幕上键入的详细信息（WorkoutViewController.xib），然后单击“保存”按钮并获得上述错误。
由于 斯蒂芬
答案 0 :(得分：0)
错误是说UiView不知道（没有实现）方法-(void)didCreateWorkout ... ....而且如果你看看你已经实现了这个方法，你会发现它在{{1} （WorkoutViewController.m），它不是UIView（我假设你的项目中只有WorkoutViewController的一个实现）。您应该仔细检查如何设置workoutDelegate属性。从您向我们展示的代码中，它应该是didCreateWorkout的实例。
顺便说一句，因为您在WorkoutViewController中也正在实施-(IBAction)saveWorkout，因此针对此特定问题的快速解决方法是将您的操作代码更改为：
WorkoutViewController但是，此快速修复程序无法解决您可能想要的设计问题。您应该考虑谁应该实施-(IBAction)saveWorkout {
[self didCreateWorkout: route.text
Type: type.text
Distance: distance.text
Time: time.text
Message: message.text];
}
-(IBAction)cancelWorkout {
[self didCancelWorkout];
}
，然后正确设置CreateWorkoutDelegate属性。
在另一个主题上，我注意到代码中有两件事你可以考虑改变：
workoutDelegate而不是self.property=nil [ivar release]属性应具有属性副本（以保护自己免受NSString个实例的攻击）