Ios 使用NSC检查文本字段中的值（用于登录）
我是IOS的超级新手。我正在做一个登录功能。按下登录按钮时，应用程序应检查存储器中的文本。然后，如果check status返回true，则应更改为第二个VC。我当前有一个带有标识符的ViewController到ViewController序列。我尝试了带标识符的执行序列，但它不起作用。（不改变场景，也不显示警报。） 这是登录页面。 #进口Ios 使用NSC检查文本字段中的值（用于登录）,ios,objective-c,xcode,Ios,Objective C,Xcode,我是IOS的超级新手。我正在做一个登录功能。按下登录按钮时，应用程序应检查存储器中的文本。然后，如果check status返回true，则应更改为第二个VC。我当前有一个带有标识符的ViewController到ViewController序列。我尝试了带标识符的执行序列，但它不起作用。（不改变场景，也不显示警报。） 这是登录页面。 #进口 @interface LoginPage : UIViewController @property (strong, nonatomic) IBOutle
@interface LoginPage : UIViewController
@property (strong, nonatomic) IBOutlet UITextField *usernameField;
@property (strong, nonatomic) IBOutlet UITextField *passwordField;
- (IBAction)LoginTapped:(id)sender;
- (IBAction)SignupTapped:(id)sender;
@end
#import "LoginPage.h"
#import "Home.h"
@implementation LoginPage
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)LoginTapped:(id)sender {
NSMutableDictionary *infodictionary =[[NSMutableDictionary alloc] init];
[infodictionary setObject:@"1" forKey:@"rose"];
[infodictionary setObject:@"2" forKey:@"cathy"];
[infodictionary setObject:@"3" forKey:@"corey"];
if ([_passwordField.text isEqualToString:[infodictionary objectForKey: _usernameField.text]]){
// Home *home = [[Home alloc] init];
[self performSegueWithIdentifier:@"ToHome" sender:self];
}
}
- (IBAction)SignupTapped:(id)sender {
NSString *_NAME = [NSString alloc];
NSString *_PASS = [NSString alloc];
_NAME= _usernameField.text;
_PASS = _passwordField.text;
}
@end
2016-02-07 05:39:49.437 project_feature_login[8249:941926] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<ViewController 0x7fb5f9c98300> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key passwordField.'
*** First throw call stack:
(
0 CoreFoundation 0x0000000102b18f45 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000102592deb objc_exception_throw + 48
2 CoreFoundation 0x0000000102b18b89 -[NSException raise] + 9
3 Foundation 0x000000010215fa6b -[NSObject(NSKeyValueCoding) setValue:forKey:] + 288
4 UIKit 0x000000010305004c -[UIViewController setValue:forKey:] + 88
5 UIKit 0x000000010327da71 -[UIRuntimeOutletConnection connect] + 109
6 CoreFoundation 0x0000000102a59a80 -[NSArray makeObjectsPerformSelector:] + 224
7 UIKit 0x000000010327c454 -[UINib instantiateWithOwner:options:] + 1864
8 UIKit 0x0000000103056c16 -[UIViewController _loadViewFromNibNamed:bundle:] + 381
9 UIKit 0x0000000103057542 -[UIViewController loadView] + 178
10 UIKit 0x00000001030578a0 -[UIViewController loadViewIfRequired] + 138
11 UIKit 0x0000000103058013 -[UIViewController view] + 27
12 UIKit 0x0000000102f3151c -[UIWindow addRootViewControllerViewIfPossible] + 61
13 UIKit 0x0000000102f31c05 -[UIWindow _setHidden:forced:] + 282
14 UIKit 0x0000000102f434a5 -[UIWindow makeKeyAndVisible] + 42
15 UIKit 0x0000000102ebd396 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4131
16 UIKit 0x0000000102ec39c3 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1750
17 UIKit 0x0000000102ec0ba3 -[UIApplication workspaceDidEndTransaction:] + 188
18 FrontBoardServices 0x0000000105870784 -[FBSSerialQueue _performNext] + 192
19 FrontBoardServices 0x0000000105870af2 -[FBSSerialQueue _performNextFromRunLoopSource] + 45
20 CoreFoundation 0x0000000102a45011 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
21 CoreFoundation 0x0000000102a3af3c __CFRunLoopDoSources0 + 556
22 CoreFoundation 0x0000000102a3a3f3 __CFRunLoopRun + 867
23 CoreFoundation 0x0000000102a39e08 CFRunLoopRunSpecific + 488
24 UIKit 0x0000000102ec04f5 -[UIApplication _run] + 402
25 UIKit 0x0000000102ec530d UIApplicationMain + 171
26 project_feature_login 0x0000000102094a6f main + 111
27 libdyld.dylib 0x000000010523c92d start + 1
28 ??? 0x0000000000000001 0x0 + 1
)
2016-02-07 05:39:49.437项目-功能-登录[8249:941926]***由于未捕获的异常“NSUnknownKeyException”而终止应用程序，原因：“[setValue:forUndefinedKey:]：该类与密钥密码字段的键值编码不兼容。”
***第一次抛出调用堆栈：
(
0 CoreFoundation 0x0000000102b18f45例外预处理+165
1 libobjc.A.dylib 0x0000000102592deb objc_异常_抛出+48
2 CoreFoundation 0x0000000102b18b89-[N异常提升]+9
3基金会0x000 000 010215FA6B-[NSbObjs]（NSKEY ValueCudid）SETValu:
4 UIKit 0x000000010305004c-[UIViewController设置值：forKey:+88
5 UIKit 0x000000010327da71-[UIRuntimeOutletConnection connect]+109
6 CoreFoundation 0x0000000102a59a80-[NSArray makeObjectsPerformSelector:+224
7 UIKit 0x000000010327c454-[UINib实例化所有者：选项：][1864
8 UIKit 0x0000000103056c16-[UIViewController\u loadViewFromNibNamed:bundle:][381
9 UIKit 0x0000000103057542-[UIViewController loadView]+178
10 UIKit 0x00000001030578a0-[UIViewController loadViewIfRequired]+138
11 UIKit 0x0000000103058013-[UIViewController视图]+27
12 UIKit 0x0000000102F351C-[UIWindow AddRootViewControllerServiceWifPossible]+61
13 UIKit 0x0000000102f31c05-[UIWindow\u setHidden:强制：][282
14 UIKit 0x0000000102f434a5-[UIWindow makeKeyAndVisible]+42
15 UIKit 0x0000000102ebd396-[UIApplication\u callInitializationDelegatesForMainScene:transitionContext:+4131
16 UIKit 0x0000000102ec39c3-[UIApplication\u在主场景中运行：transitionContext:completion:+1750
17 UIKit 0x0000000102ec0ba3-[UIApplication WorkspaceDiEndTransaction:][188
18 FrontBoardServices 0x0000000105870784-[FBSSerialQueue\u performNext]+192
19 FrontBoardServices 0x0000000105870af2-[FBSSerialQueue _performNextFromRunLoopSource]+45
20 CoreFoundation 0x0000000102a45011\uuu CFRUNLOOP\u正在调用\u OUT\u以执行\u功能\uuuu+17
21 CoreFoundation 0x0000000102a3af3c\uU CFRunLoopDoSources0+556
22 CoreFoundation 0x0000000102A3F3\uuu CFRunLoopRun+867
23 CoreFoundation 0x0000000102a39e08 CFRunLoopRunSpecific+488
24 UIKit 0x0000000102ec04f5-[UIApplication\u run]+402
25 UIKit 0x0000000102ec530d UIApplicationMain+171
26项目功能登录0x0000000102094a6f主+111
27 libdyld.dylib 0x000000010523c92d启动+1
28°？0x0000000000000001 0x0+1
)
寻求帮助 在验证if条件时，尝试使用
self.passwordField.text\u passwordField.text