Objective c iOS 传递数据

Posted 2023-03-11

【中文标题】Objective c iOS 传递数据

【英文标题】：Objective c iOS passing data

【发布时间】：2017-05-31 06:46:53

【问题描述】：

嗨，我是 ios 新手，下面是我的代码，我必须通过从请求回复中获得的顶部...请帮助我，我被困在这里 第一个视图控制器是 otp 视图第二个 vc 是 verifyviewcontroller

OTP 视图 c.h

#import <UIKit/UIKit.h>
@interface OtpViewController : UIViewController
@property (nonatomic, retain) NSString *str;
@end

otpviewcontroller.m

#import "OtpViewController.h"
#import "VerifyViewController.h"
@interface OtpViewController () <VerifyViewControllerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *bbi;
@property (weak, nonatomic) IBOutlet UIButton *submittf;
@property (weak, nonatomic) IBOutlet UITextField *mobiletf;
@property (weak,nonatomic) NSArray *tmp;
@property(weak,nonatomic) NSString *requestReply ;
//@property(weak,nonatomic) NSDictionary *A;
@end

@implementation OtpViewController
- (void)viewDidLoad 
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"background"]];
NSLog(@"viewDidLoad");
[super viewDidLoad];



- (IBAction)submitb:(id)sender
 

if (_mobiletf.text && _mobiletf.text.length >0 )

    /* not empty - do something */
    NSString *post = [NSString stringWithFormat:@"phone=%@",_mobiletf.text];
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    //  Next up, we read the postData's length, so we can pass it along in the request.

    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
    // Now that we have what we'd like to post, we can create an NSMutableURLRequest, and include our postData.

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:@"http://www.sitesandflats.com/send_otp.php"]];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:postData];
    NSLog(@"the data Details is %@", post);

    //   And finally, we can send our request, and read the reply by creating a new NSURLSession:

    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    [[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) 
        NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
        NSLog(@"requestReply: %@", requestReply);
        NSString *str=requestReply;
        VerifyViewController *vc = [[VerifyViewController alloc] init];
        NSString  *tmp=requestReply;
        NSLog(@"%@",str);
        NSLog(@"%@",_tmp);

    ] resume];
    [ self performSegueWithIdentifier:@"b1" sender:self];
   
else

    /* what ever */
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
        message:@"Please check your input!!."
        delegate:self
        cancelButtonTitle:@"OK"
        otherButtonTitles:nil];
    [alert show];





- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(nullable id)sender

VerifyViewController *loadCtr = (VerifyViewController *)segue.destinationViewController;
loadCtr.delegate = self;
loadCtr.tmpStr = (@"otp: %@",_tmp);
NSLog(@"passing val: %@",_tmp);

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

return YES;

验证视图控制器.h

#import <UIKit/UIKit.h>
@protocol VerifyViewControllerDelegate <NSObject>
-(void)moveToA:(NSString *)str;
@end
@interface VerifyViewController : UIViewController
@property (nonatomic, copy) NSString *tmpStr;
@property (nonatomic, assign) id <VerifyViewControllerDelegate> delegate;
//@property (nonatomic, strong) OtpViewController *received;
//@property (strong, nonatomic) IBOutlet UITextField *textDisplay;
@property(nonatomic,weak) NSMutableArray *myAray;
@property(nonatomic,strong) NSString *object;
@property(strong,nonatomic) NSString *tmp1;
@end

验证视图控制器.m

#import "VerifyViewController.h"
#import "OtpViewController.h"
@interface VerifyViewController ()
@property (weak, nonatomic) IBOutlet UITextField *otptf;
@property (weak, nonatomic) IBOutlet UIButton *submitb;
//@property (weak,nonatomic) textDisplay;
//@property (weak,nonatomic) NSString  *received;
@end


@implementation VerifyViewController
- (void)viewDidLoad 
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage     imageNamed:@"background"]];

// Do any additional setup after loading the view.

- (IBAction)submitb:(id)sender 
NSLog(@"%@",_tmpStr); 
if(_otptf.text==_tmpStr)

    [self performSegueWithIdentifier:@"b2" sender:self];

else

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                    message:@"Incorrect otp please check the input!!!."
                                                   delegate:self
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];






- (void)didReceiveMemoryWarning 
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.


@end

在 nslog 我收到回复为 ("success":"1";"otp":"985123") 我需要这个 otp 来存储并在下一页验证请帮助

【问题讨论】：

您可能会发现this 链接很有帮助。

2017-05-31 12:10:12.540 MenuBar[1315:76259] 数据详情为 phone=9047038606 2017-05-31 12:10:12.554 MenuBar[1315:76259] 传递值： (null) 2017-05-31 12:10:13.267 MenuBar[1315:76307] requestReply: "success":1,"otp":"118301" 2017-05-31 12:10:13.268 MenuBar[1315: 76307] "success":1,"otp":"118301" 2017-05-31 12:10:13.269 MenuBar[1315:76307] "success":1,"otp":"118301"跨度>

@EvgeniyKleban 我已经检查过了，但答案是通过布尔值

你能解释一下你想做什么吗？

我需要这个顶部来存放可以纠正这个吗？顶部还是 otp ？

【参考方案1】：

首先你需要改变属性

来自

@property (weak,nonatomic) NSArray *tmp;

收件人

 @property (strong,nonatomic) NSStirng *tmp;

如下为tmp赋值

[[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) 
           NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; // this is json string
           NSError *error;
           NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error]; // you need to convert to dictionary object

            NSLog(@"requestReply: %@", jsonDict);
            self.tmp=[jsonDict valueForKey:@"otp"] ; // you need to extract value using the key   [requestReply valueForKey:@"otp"];
            NSLog(@"%@",self.tmp);

    ] resume];

将 tmp 传递给 VerifyVIewController

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(nullable id)sender

VerifyViewController *loadCtr = (VerifyViewController *)segue.destinationViewController;
loadCtr.delegate = self;
loadCtr.tmpStr = self.tmp;
NSLog(@"passing val: %@",_tmp);

【讨论】：

感谢您的努力！！bt stilll 我在日志中传递的值为 null

2017-05-31 12:43:32.741 MenuBar[1398:90037] 传递 val: (null) 2017-05-31 12:43:33.464 MenuBar[1398:90096] requestReply:"成功":1,"otp":"753161" 2017-05-31 12:43:33.464 MenuBar[1398:90096] "success":1,"otp":"753161"

你需要提取价值。

self.tmp = [requestReply valueForKey:@"otp"];

2017-05-31 12:51:08.063 MenuBar[1435:93502] *** 由于未捕获的异常“NSUnknownKeyException”而终止应用程序，原因：“[<__nscfstring> valueForUndefinedKey:]: this类不符合键 otp 的键值编码。 *** 首先抛出调用栈：