小编tka*_*kic的帖子

正如标题中所写,我有一个属性UITextField.我把它UITextField加到了UIView.

如果我有一个强大的指针,UITextField出现,

如果我有一个弱指针,UITextField则不会出现.

当我有一个弱指针时出了什么问题？我做了同样的UIButton事情,然后它实际上出现(强指针和弱指针).

这是一些代码:

CreateCategoryView.h

@interface CreateCategoryView : UIView 

@property (weak, nonatomic) UITextField *nameTextField;

@end

CreateCategoryView.m

@implementation CreateCategoryView

- (id)initWithFrame:(CGRect)frame andParent {
    self = [super initWithFrame:frame];
    if (self) {
        self.nameTextField = [[UITextField alloc] initWithFrame:CGRectMake(5, 30, 310, 25)];
        self.nameTextField.borderStyle = UITextBorderStyleRoundedRect;
        self.nameTextField.textColor = [UIColor blackColor];
        self.nameTextField.backgroundColor = [UIColor whiteColor];
        [self addSubview:self.nameTextField];
    }
    return self;
}

@end

我通常创建initialize()用于设置on-click侦听器的函数和函数,然后从Activity中调用这些函数onCreate().当我打电话给someView.setOnClickListener(...)某个功能时,我应该检查一下是否someView == null？我知道,它!= null,但我需要一个关于编码风格的建议.哪种是最佳做法？
这是一个例子:

...
public class SomeActivity extends Activity
{
    private ImageButton someButton;
    private Intent someIntent;

    public void onCreate(Bundle icicle)
    {
        super.onCreate(icicle);
        setContentView(R.layout.add_alarm);        
        initialize();
        setSomeButtonHandler();
    }

    public void initialize()
    {
        someButton = (ImageButton) findViewById(R.id.someButton);
    }

    public void setSomeButtonHandler()
    {
        if(someButton != null) //Should I check this?
        {
            someIntent = new Intent(SomeActivity.this, SomeButtonActivity.class);
            someButton.setOnClickListener(new View.OnClickListener()
            {
                public void onClick(View v)
                {
                    startActivity(someIntent);
                }
           });
        }   
    }
}

我正在使用此代码

-(void)gotoInformationViewController:(id)sender
{
    MoreViewController *moreViewController = [[MoreViewController alloc] init];
    [self.navigationController pushViewController:moreViewController animated:YES];
    [moreViewController release];
}

推动一个MoreViewController(这是UITableViewController),但它UINavigationBar在推动时没有,只是UITableView在整个屏幕上.

我使用故事板生成了一个新的选项卡式应用程序.

到目前为止我有

TabBarController - > FirstViewController - > SecondViewController - > ModalViewController

我正在尝试在显示tabBarController之前打开模态视图.我在AppDelegate.m上添加了以下代码

showModalView 被称为 application:didFinishLaunchingWithOptions:;

- (void)showModalView
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    GSLoginViewController *loginView = [storyboard instantiateViewControllerWithIdentifier:@"loginView"];
    [loginView setModalPresentationStyle:UIModalPresentationFullScreen];
    [self.window.rootViewController presentViewController:loginView animated:YES completion:NULL];
}

在这里输出我:

Warning: Attempt to present <ModalViewController: 0x93670d0> on 
<UITabBarController: 0x935d170> whose view is not in the window hierarchy!