iOS 重定向到新的 ViewCONtroller 不会加载所有 UI 元素

Question

我正在尝试实现 google map 模块以在添加 mARKER 之前设置控制参数

出路是通过NSBUndles发起获取新的viewController的结果。我的愿望目标是重定向到与预期结果相同的 ViewController。

但是当涉及到实现时，它会加载实际结果:

预期结果: 实际结果

您能否告诉我实例化一个新的 ViewController 并将所有 UI 元素都设置为预期的 viewControllers 的其他细节？我发誓新的 ViewController 已经设置了所有需要的元素？

实际的控制台消息是这样写的:

2014-06-18 17:50:37.766 marker[1469:60b] Text=2014-06-18 17:50:36
2014-06-18 17:50:41.102 marker[1469:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Storyboard (<UIStoryboard: 0x17daf180>) doesn't contain a view controller with identifier 'SliderViewController''
*** First throw call stack:
(0x3102dfd3 0x3b7dcccf 0x33d1bfb7 0x7e155 0x31031584 0x30f7c0db 0x30f7f873 0x231ffb 0x310300f1 0x30f7f7b8 0x20d6bb 0x138133 0x155319 0x339d000d 0x3387b503 0x33c22af5 0x33842373 0x33840abb 0x30ff92a5 0x30ff6c49 0x30ff6f8b 0x30f61f0f 0x30f61cf3 0x35e66663 0x338ad16d 0x7f4ed 0x3bce9ab7)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

下面是我的代码

-(void) mapView:(GMSMapView *)mapView didLongPressAtCoordinate:(CLLocationCoordinate2D)coordinate{


sliderVC = [self.storyboard instantiateViewControllerWithIdentifier:@"SliderViewController"];
    sliderVC.view.backgroundColor = [UIColor yellowColor];
    self.modalPresentationStyle = UIModalPresentationCurrentContext;
    [self presentViewController:sliderVC animated:YES completion:NULL];


}

仅限新 viewCONtroller (.m) 的代码:

#import "SliderViewController.h"
#import <AudioToolbox/AudioServices.h>
#import "EFCircularSlider.h"

@interface SliderViewController (){
    NSString *valueV;
    NSString *valueC;
}

@end

@implementation SliderViewController


- (void)viewDidLoad
{
    [super viewDidLoad];

    _uiSlider.minimumValue = 0.0;
    _uiSlider.maximumValue = 100.0;
    [_uiSlider removeConstraints:_uiSlider.constraints];
    [_uiSlider setTranslatesAutoresizingMaskIntoConstraints:YES];

    float value  = M_PI * -0.5 ;
   _uiSlider.transform = CGAffineTransformMakeRotation(value);

    CGRect sliderFrame = CGRectMake(60, 300, 100, 100);
    EFCircularSlider* circularSlider = [[EFCircularSlider alloc] initWithFrame:sliderFrame];
    [circularSlider addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:circularSlider];
    [circularSlider setCurrentValue:10.0f];


    // Do any additional setup after loading the view.
}

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

-(void)valueChanged:(EFCircularSlider*)slider {
    self.uiValue2.text = [NSString stringWithFormat:@"%.02f", slider.currentValue ];
    valueC =  self.uiValue2.text;
    if(slider.currentValue  > 20.0 && slider.currentValue  < 30.0  ){
        AudioServicesPlaySystemSound(1003);
       // AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
    }
}


- (IBAction)reset:(id)sender {
    [self writeToTextFile:valueV :valueC];
    self.uiValue.text =[NSString stringWithFormat:@"%.2f" , 0.00];
    [self.uiSlider setValue:0.00];
  }



-(void) writeToTextFile:(NSString*) values : (NSString*) values2 {
    //get the documents directory:
    NSArray *paths = NSSearchPathForDirectoriesInDomains
    (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    //make a file name to write the data to using the documents directory:
    NSString *fileName = [NSString stringWithFormat:@"%@/slider.txt",documentsDirectory];
    //create content - four lines of text
    NSString *content = [NSString stringWithFormat:@"%@%@%@%@", values , @"\n" , values2 , @"\n" ];
    //save content to the documents directory
    [content writeToFile:fileName
              atomically:YES
                encoding:NSStringEncodingConversionAllowLossy
                   error:nil];
      NSLog(@"%@",documentsDirectory);
    [self displayContent];
}

-(void) displayContent{
    //get the documents directory:
    NSArray *paths = NSSearchPathForDirectoriesInDomains
    (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    //make a file name to write the data to using the documents directory:
    NSString *fileName = [NSString stringWithFormat:@"%@/slider.txt",
                          documentsDirectory];
    NSString *content = [[NSString alloc] initWithContentsOfFile:fileName
                                                    usedEncoding:nil
                                                           error:nil];
    //use simple alert from my library (see previous post for details)

    NSLog(@"%@",content);
    // [self showEmail:fileName];
}


- (IBAction)sliderChange:(id)sender {
    UISlider *slider = (UISlider *)sender;
    NSString *newValue = [NSString stringWithFormat:@"%.2f" , slider.value];
    self.uiValue.text = newValue;
    valueV  = self.uiValue.text;
    if(slider.value > 30 && slider.value < 50){
        AudioServicesPlaySystemSound(1003);
        //AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
    }
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end

Answer 1

创建新的 View Controller 时，您必须使用 nib 文件实例化它，例如:

sliderVC = [[SliderViewController alloc] initWithNibName:@"SliderViewController"bundle:nil]

或者如果您使用 Storyboard:

sliderVC = [self.storyboard instantiateViewControllerWithIdentifier:@"SliderViewController"];

否则，没有与您在 Interface Builder 中创建的文件的连接，并且 iOS 不知道要为此 View Controller 加载哪些 UI 元素。

更新:这是您必须设置字符串的地方: