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我從UIViewController調用NSObject，並將視圖控制器設置爲NSObject的委託。設置委託導致崩潰
當執行該代碼時，應用程序完全靠模擬器崩潰由於EXC_BAD_ACCESS（如何在這裏適用？）。當應用在真實設備上運行時，該應用第三次執行代碼時崩潰。真正的設備日誌的輸出低於：
(First time)
2012-04-01 13:29:05.154 The Record[19044:707] Done
----
(Second time)
2012-04-01 13:29:06.274 The Record[19044:707] Done
----
(Third time)
2012-04-01 13:29:07.772 The Record[19044:707] -[ViewController setDelegate:]: unrecognized selector sent to instance 0xde2e6e0
2012-04-01 13:29:07.773 The Record[19044:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ViewController setDelegate:]: unrecognized selector sent to instance 0xde2e6e0'
*** First throw call stack:
(0x3211088f 0x37515259 0x32113a9b 0x32112915 0x3206d650 0x537f7 0x4f82b 0x3206a3fd 0x379eafaf 0x37ab076b 0x3206a3fd 0x379eafaf 0x379eaf6b 0x379eaf49 0x379eacb9 0x379eb5f1 0x379e9ad3 0x379e94c1 0x379cf83d 0x379cf0e3 0x3144322b 0x320e4523 0x320e44c5 0x320e3313 0x320664a5 0x3206636d 0x31442439 0x379fde7d 0x4dd8d 0x4dd38)
terminate called throwing an exception(lldb)
我打電話NSObject的和設置視圖控制器爲委託。
Authorization *authorization = [[Authorization alloc] init];
authorization.delegate = self;
當我拿出authorization.delegate = self;應用程序不會崩潰，但我顯然需要該行。
編輯：這是代碼。我正在使用@protocol。 Authorization.h：
#import <Foundation/Foundation.h>
#import "KeychainItemWrapper.h>
@protocol AuthorizationDelegate <NSObject>
- (void)done:(BOOL *)done downloadURL:(NSURL *)downloadURL username:(NSString *)username password:(NSString *)password reason:(NSString *)reason;
@end
@interface Authorization : NSObject {
id<AuthorizationDelegate> delegate;
KeychainItemWrapper *keychain;
}
-(id)init;
@property (nonatomic, assign) id<AuthorizationDelegate> delegate;
@end
----
//Authorization.m
#import "Authorization.h"
#import "ASIFormDataRequest.h"
#import "JSON.h"
@implementation Authorization
@synthesize delegate;
-(id)init {
keychain = [[KeychainItemWrapper alloc] initWithIdentifier:@"exampleID" accessGroup:nil];
NSString *passPhrase = [keychain objectForKey:(id)kSecValueData];
// Start request
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://www.website.com/authorization.php"]];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setPostValue:passPhrase forKey:@"passphrase"];
[request setPostValue:@"YES" forKey:@"receivingAuthorization"];
[request setDidFinishSelector:@selector(requestFinished:)];
[request setDidFailSelector:@selector(requestFailed:)];
[request setDelegate:self];
[request startAsynchronous];
}
-(void)requestFinished:(ASIHTTPRequest *)request {
if (request.responseStatusCode == 200) {
NSString *responseString = [request responseString];
NSDictionary *responseDict = [responseString JSONValue];
NSString *downloadString = [responseDict objectForKey:@"downloadURL"];
NSString *username = [responseDict objectForKey:@"username"];
NSString *password = [responseDict objectForKey:@"password"];
if ((downloadString != nil) && (username != nil) && (password != nil)) {
NSURL *downloadURL = [NSURL URLWithString:downloadString];
[delegate done:YES downloadURL:downloadURL username:username password:password reason:@"Received Authorization"];
} else {
[delegate done:NO downloadURL:nil username:nil password:nil reason:@"Invalid Request"];
}
} else if (request.responseStatusCode == 400) {
if ([[request responseString] compare:@"Invalid passphrase"] == 0) {
[delegate done:NO downloadURL:nil username:nil password:nil reason:@"Incorrect Credentials"];
} else if ([[request responseString] compare:@"Invalid request"] == 0) {
[delegate done:NO downloadURL:nil username:nil password:nil reason:@"Invalid Request"];
}
} else {
[delegate done:NO downloadURL:nil username:nil password:nil reason:@"Invalid Request"];
}
}
@end
----
//ViewController.h
@interface ViewController : UIViewController <IssuesPickerDelegate, IssueTableDelegate, AuthorizationDelegate> {
Authorization *authorization;
}
@property (nonatomic, retain) Authorization *authorization;
----
//ViewController.m
@synthesize authorization;
-(void)done:(BOOL *)done downloadURL:(NSURL *)downloadURL username:(NSString *)username password:(NSString *)password reason:(NSString *)reason {
NSLog(@"Done");
if ((done == YES) && ([reason compare:@"Received Authorization"] == 0)) {
} else if ([reason compare:@"Incorrect Credentials"] == 0) {
Login *login = [[Login alloc] init];
}
}
-(void)getAuthorization {
//this part here causes the crash
authorization = [[Authorization alloc] init];
authorization.delegate = self;
}
錯誤消息表示由於在名爲'ViewController'的類上設置委託而崩潰，但是您說這個類是'Authorization'。你能詳細說明一下嗎？ – 2012-04-01 17:36:59
請發佈您的代碼，只是我們可以幫助您。 – 2012-04-01 17:40:40
@ParthBhatt我在看那個鏈接。給我一秒鐘的傢伙！ – 2012-04-01 17:42:56