Question

我正在尝试从UIAlertView模态到视图控制器。

- (IBAction)cancelScripting:(id)sender {


UIAlertView *areYouSure = [[UIAlertView alloc]initWithTitle:@"Are You Sure?" message:@"Are you sure you want to quit scripting?" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];

[areYouSure show];



}


- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

if (buttonIndex == 1) {


    CRHViewController *firstView = [[CRHViewController alloc] init];


    [self.navigationController modalViewController:firstView animated:YES];    }
}

在我的.h文件中，我有一个UINavigatoinDelegate设置

@interface CRHScripting : UIViewController     <UITextViewDelegate,UINavigationControllerDelegate>

在storyboard中，我将视图控制器的标识符设置为firstView。

该行

[self.navigationController modalViewController:firstView animated:YES];

给了我所有的麻烦。错误说

"No visible @interface for 'UINavigationController' declares the selector     'modalViewController:animated:'

这是什么意思？

更新：现在我的视图无法完全加载，但会显示视图控制器

这是我的初始代码：

#import "CRHViewController.h"

@interface CRHViewController ()

@end

@implementation CRHViewController


-(void)updateTimer {

NSDateFormatter *format = [[NSDateFormatter alloc]init];

[format setDateFormat:@"h:mm"];
clockLabel.text = [format stringFromDate:[NSDate date]];

}


- (void)viewDidLoad
{
    [super viewDidLoad];




    // Do any additional setup after loading the view, typically from a nib.

    timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self     selector:@selector(updateTimer) userInfo:nil repeats:YES];

    [homeIconScrollView setScrollEnabled:YES];
    [homeIconScrollView setContentSize:CGSizeMake (150,1100)];

    NSLog(@"Did Load first View"); 

}

- (void)viewDidAppear:(BOOL)animated {



[UIImageView beginAnimations:NULL context:nil];
[UIImageView setAnimationDuration:2];
[scrollNotify setAlpha:0];
[UIImageView commitAnimations];


}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}

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

@end

Answer 1

你有一个拼写错误：presentModalViewController。

它会抛出该错误，因为它无法找到您拼写错误名称的方法

Answer 2

- (void)presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion是UIViewController方法，而不是UINavigationController方法。正确的行是：

[self presentViewController:firstView animated:YES completion:nil];

*请注意，- (void)presentModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated现在显示为已弃用。如果您仍想使用它：

[self presentModalViewController:firstView animated:YES];

无法从UIAlertView更改viewcontroller

2 个答案: