Question

我有一个viewcontroller将它命名为viewcontroller1。我已将uiview拖到此viewcontroller，并通过操作向该视图添加了一些按钮。此外，还为该uiview创建了自定义视图类。这个uiview充当了viewcontroller1的顶级栏。我有更多的viewcontrollers，我也通过使用viewwithtag方法获取uiview来为那些viewcontrollers使用相同的uiview。但是当我使用这种方法时，代表们没有工作。当从uiview类调用委托时，我获得了thread1 exc_bad访问权限。任何帮助表示赞赏。这是我的uiview课程

// topview.h

@protocol buttonprotocol <NSObject>

-(void) button1pressed;
-(void) button2pressed;

@end
#import <UIKit/UIKit.h>

@interface topview : UIView
- (IBAction)button1action:(id)sender;
- (IBAction)button2action:(id)sender;
@property (nonatomic,assign) id <buttonprotocol> delegate;
@property (weak, nonatomic) IBOutlet UIButton *button1;
@property (weak, nonatomic) IBOutlet UIButton *button2;
@end

// topview.m

#import "topview.h"

@implementation topview

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/
- (IBAction)button1action:(id)sender
{
    [self.delegate button1pressed];
}
- (IBAction)button2action:(id)sender
{
    [self.delegate button2pressed];
}
@end

下面给出的是第一个viewcontroller

// ViewController.h

#import <UIKit/UIKit.h>
#import "topview.h"
#import "button1ViewController.h"
#import "button2ViewController.h"
@interface ViewController : UIViewController
<buttonprotocol>
@property (weak, nonatomic) IBOutlet topview *topviewobj;


@end

// ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    _topviewobj.delegate=self;
    UIView *newview=[[UIView alloc]initWithFrame:CGRectMake(0, 250, 320, 100)];
    newview=[self.view viewWithTag:1];
    [self.view addSubview:newview];
    // Do any additional setup after loading the view, typically from a nib.
}
-(void) button1pressed
{
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    button1ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"button1ViewController"];
    [self presentViewController:vc animated:NO completion:nil];
}
-(void) button2pressed
{
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    button2ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"button2ViewController"];
    [self presentViewController:vc animated:NO completion:nil];
}

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

下面给出的是点击第一个按钮时viewcontroller的视图控制器类。

// button1ViewController.h

#import <UIKit/UIKit.h>
#import "topview.h"
#import "ViewController.h"
#import "button2ViewController.h"
@class topview;
@interface button1ViewController : UIViewController
<buttonprotocol>
{
    UIView *newview;
    topview *topviewobj;
}
@end

// button1ViewController.m

#import "button1ViewController.h"

@interface button1ViewController ()

@end

@implementation button1ViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    topviewobj=[topview new];
    topviewobj.delegate=self;
    NSLog(@"%@",topviewobj.delegate);
    self.view.backgroundColor=[UIColor purpleColor];
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
    newview=[[UIView alloc]init];
    newview=[vc.view viewWithTag:1];
    UIButton *backbutton=[[UIButton alloc]init];
    [backbutton setTitle:@"Back" forState:UIControlStateNormal];
    [backbutton setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [backbutton setFrame:CGRectMake(5, 30, 60, 30)];
    [backbutton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
    [newview addSubview:backbutton];
    [self.view addSubview:newview];
    // Do any additional setup after loading the view.
}
-(void) back
{
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
    [self presentViewController:vc animated:NO completion:nil];
}
-(void) button1pressed
{
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    button1ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"button1ViewController"];
    [self presentViewController:vc animated:NO completion:nil];
}
-(void) button2pressed
{
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    button2ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"button2ViewController"];
    [self presentViewController:vc animated:NO completion:nil];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

下面给出了轻触第二个按钮时viewcontroller的viewcontroller类。

// button2ViewController.h

#import <UIKit/UIKit.h>
#import "topview.h"
#import "ViewController.h"
@class topview;
@interface button2ViewController : UIViewController
<buttonprotocol>
{
    UIView *newview;
    topview *topviewobj;
}
@end

// button2ViewController.m

#import "button2ViewController.h"

@interface button2ViewController ()

@end

@implementation button2ViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    topviewobj=[topview new];
    topviewobj.delegate=self;
    NSLog(@"%@",topviewobj.delegate);
    self.view.backgroundColor=[UIColor purpleColor];
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
    newview=[[UIView alloc]init];
    newview=[vc.view viewWithTag:1];
    UIButton *backbutton=[[UIButton alloc]init];
    [backbutton setTitle:@"Back" forState:UIControlStateNormal];
    [backbutton setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [backbutton setFrame:CGRectMake(5, 30, 60, 30)];
    [backbutton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
    [newview addSubview:backbutton];
    [self.view addSubview:newview];
    // Do any additional setup after loading the view.
}
-(void) back
{
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
    [self presentViewController:vc animated:NO completion:nil];
}
-(void) button1pressed
{
    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    button1ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"button1ViewController"];
    [self presentViewController:vc animated:NO completion:nil];
}
-(void) button2pressed
{
//    UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
//    button2ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"button2ViewController"];
//    [self presentViewController:vc animated:NO completion:nil];
}


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

@end

这就是我得到的全部。由于隐私问题，我无法显示原始代码。这是为显示问题而创建的示例。由于声誉不佳，我无法上传图片。

Answer 1

这看起来非常可疑......

UIView *newview=[[UIView alloc]initWithFrame:CGRectMake(0, 250, 320, 100)];
newview=[self.view viewWithTag:1];
[self.view addSubview:newview];

如果下一行要使用viewWithTag，则不应该为init分配一个新视图，因为该视图已经被引入。同样在下一行中，您可以在刚刚获得视图的同一个内容上调用addSubView，只有在已添加视图的情况下才能使用该视图。

修改

在进一步检查您的代码后，我会看到您要做的事情。有几点需要注意。如果要将对象传递给新的视图控制器，可以在创建新的视图控制器时执行此操作。

UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil]; button1ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"button1ViewController"]; //if button1ViewController had a property for topviewobj instead of an instance variable. button1ViewController.topviewobj = (topview *)[self.view viewWithTag:1]; [self presentViewController:vc animated:NO completion:nil]; //in button1ViewController viewDidLoad self.topviewobj.delegate = self; [self.view addSubView:self.topviewobj];

说实话，我认为你真正想做的就是在代码中查看笔尖或创建topview。

如果只是在代码中它就像

_topviewobj = [[topview alloc]initWithFrame:CGRectMake(0,250, 320, 100)]; _topviewobj.delegate = self; [self.view addSubview:_topviewobj];

这也可能会在将来引发问题......

-(void) back { UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil]; ViewController *vc=[storyboard instantiateViewControllerWithIdentifier:@"ViewController"]; [self presentViewController:vc animated:NO completion:nil]; }

一遍又一遍地创建新的UIViewControllers并不理想。试试这个......

-(void) back { [self dismissViewControllerAnimated:YES completion:nil]; }

正如我之前所说，我会查看nib或只是创建一个UIView子类和alloc / init，设置委托，并在需要时添加为子视图。

我希望所有这些都有意义并有所帮助。

许多viewcontrollers的单一uiview

1 个答案: