我可以调用ViewController类中的哪个方法来检查它何时被带到前台？
例如,我在我的应用程序上查看一个页面,然后我决定关闭该应用程序并稍后再回到它.当我回到它时,屏幕上显示的是我所看到的相同视图.但是......一旦我打开应用程序,我想转到另一个视图.
我怎样才能做到这一点？
目前尝试这个:
- (void) applicationDidBecomeActive:(NSNotification*) notification
{
[self checkActivity];
// Do your stuff here
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(applicationWillEnterForeground:)
name:UIApplicationWillEnterForegroundNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(applicationDidBecomeActive:)
name:UIApplicationDidBecomeActiveNotification
object:nil];
}
return self;
}
- (void)checkActivity{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSLog(@"Checking if re-authentication required...");
if([[defaults objectForKey:@"shouldgotologin"] isEqualToString:@"yes"]){
NSLog(@"View Should go to login...performing segue");
[defaults setObject:@"no" forKey:@"shouldgotologin"];
[defaults synchronize];
[self performSegueWithIdentifier:@"backtologin" sender:self];
} else …嗨伙计们,我有一个字符串,我试图存储到SharedPreferences:
这是我用来存储字符串的方法:
全球大战:
private ArrayList<String> mListEmailAddresses;
方法:
public void setEmailAddressList(String emailAddress){
emailAddress.replaceAll(",", "");
mListEmailAddresses.add(emailAddress);
SharedPreferences prefs = getSharedPreferences("invitefriends", 0);
StringBuilder str = new StringBuilder();
for (int i = 0; i < mListEmailAddresses.size(); i++) {
str.append(mListEmailAddresses.get(i).toString()).append(",");
}
LogUtils.log("emails: " + str.toString());
String theString = str.toString();
prefs.edit().putString("emails", theString);
prefs.edit().commit();
}
每次调用此方法时,都会使用添加到列表中的新电子邮件更新str.toString方法.例如"email1 @ gmail.com,email2 @ yahoo.co.uk,email3 @ hotmail.co.uk"将成为形成的字符串.日志正确显示此字符串.然后我将theString放在关键字"电子邮件"下,每当视图重新启动时,它都会刷新,如下所示:
SharedPreferences prefs = getSharedPreferences("invitefriends", 0);
String savedString = prefs.getString("emails", "");
LogUtils.log("saved emails: " + savedString);
StringTokenizer st = new StringTokenizer(savedString, ",");
mListEmailAddresses = new ArrayList<String>(); …我正在使用条带SDK,它创建卡片详细信息的视图.代码如下:
//live key
NSString *cardApiKey;
if([hostType isEqualToString:@"production"])
{
cardApiKey = @"xxxxxxxxxxxxxxxxxxxxx";
} else {
cardApiKey = @"xxxxxxxxxxxxxxxxxxxxx";
}
self.stripeView = [[STPView alloc] initWithFrame:CGRectMake(10, _cardDetailsLabel.frame.origin.y+_cardDetailsLabel.frame.size.height+10, 200, 55) andKey:cardApiKey];
[self.canvasView addSubview:self.stripeView];
self.stripeView.delegate = self;
问题是数字键盘键盘默认显示.我不希望每次初始化stripeview时都会弹出数字键盘.我怎么能绕过这个？谢谢.
好吧..当我将手机插入计算机时,它启动应用程序,睡眠()完成后,它会崩溃并显示底部显示的错误.我认为你需要的所有代码都显示在引文中.
真的很困惑我为什么会遇到这个问题.我的mainActivity.java文件看起来像这样:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Thread timer = new Thread(){
public void run(){
try{
sleep(1000);
} catch (InterruptedException e){
e.printStackTrace();
}finally{
Intent intent = new Intent("com.worcestershire.android.Pagetwo", null);
startActivity(intent);
}
}
};
timer.start();}
第2页看起来像这样:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@raw/logo"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:text="This is Activity 2" />
<Button android:text="Previous"
android:id="@+id/Button02"
android:layout_width="250px"
android:textSize="18px"
android:layout_height="55px">
</Button>
</LinearLayout>
我的清单看起来像这样:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.worcestershire.android"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="7" />
<application
android:icon="@drawable/maps_launcher"
android:label="@string/app_name" …如何才能在使用 UIScrollView 时不调用平移手势识别器选择器。
我希望能够在不调用平移手势选择器的情况下在滚动视图中滚动。
这是我的平底锅检测功能：
- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{
CGPoint translation = [panRecognizer translationInView:self.view];
CGPoint imageViewPosition = self.draggableImage.center;
imageViewPosition.x += translation.x;
imageViewPosition.y += translation.y;
self.draggableImage.center = imageViewPosition;
[panRecognizer setTranslation:CGPointZero inView:self.view];
}
当我在页面底部使用 UIScrollView 时，我不希望它被调用。