我目前正在 4 张图像之间制作动画，如下所示：
UIImageView *tom3BeforeImage;
tom3Images = [NSArray arrayWithObjects: [UIImage imageNamed:@"floortom_before1.png"],[UIImage imageNamed:@"floortom_before2.png"],[UIImage imageNamed:@"floortom_before3.png"],[UIImage imageNamed:@"floortom_before4.png"], nil ];
tom3BeforeImage.animationImages = tom3Images;
tom3BeforeImage.animationDuration = 0.75;
[tom3BeforeImage startAnimating];
它工作正常，除了图像之间的动画断断续续。我需要的持续时间正好是 0.75 秒，所以加快速度不是一种选择。
让动画在图像之间更平滑的最佳方法是什么，有点像在每个图像变化之间进行混合？
谢谢！
我正在使用以下代码为我的UIWebView发送的请求设置自定义HTTP标头.问题是我看到页面加载一秒钟然后它进入白色/空白屏幕.我已经测试了不同的URL,但行为是相同的.有任何想法吗？
func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
var headerIsPresent = false
let headerFields = request.allHTTPHeaderFields
for headerField in headerFields?.keys.array as [String] {
if headerField == "X-Test-App" {
headerIsPresent = true
}
}
if headerIsPresent {
return true
} else {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
dispatch_async(dispatch_get_main_queue(), {
let url = request.URL
var newRequest: NSMutableURLRequest = request as NSMutableURLRequest
// set new header
newRequest.addValue("MyValue", forHTTPHeaderField: "X-Test-App")
// reload the request
self.webView.loadRequest(newRequest)
})
})
return false
}
}
我正在使用MediaStyle进行推送通知,以便我可以显示当前播放的歌曲元数据以及包含暂停按钮.我看到的问题是我的通知不会自动展开以显示暂停按钮,即使我已经包含了setShowActionsInCompactView().如果我在锁定屏幕上下拉通知,它会展开,然后显示暂停按钮.但我希望它能显示按钮而不会扩展.
显示通知的屏幕截图:http: //cl.ly/image/3E2D0m403v1b
下拉展开后如何显示通知的屏幕截图:http: //cl.ly/image/1N1i0G121i2Y
以下是我用于生成通知的代码段:
PendingIntent pi = PendingIntent.getActivity(getApplicationContext(), 0, new Intent(getApplicationContext(), MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
Bitmap icon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
Intent intent = new Intent(BROADCAST_PLAYER_STOP);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
NotificationCompat.Builder notification = new NotificationCompat.Builder(this)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.setContentTitle(getResources().getString(R.string.app_name))
.setTicker(tickerString)
.setContentText(contentString)
.setSmallIcon(R.drawable.ic_notification)
.setLargeIcon(icon)
.addAction(R.drawable.ic_media_pause, "", pendingIntent)
.setContentIntent(pi)
.setStyle(new android.support.v7.app.NotificationCompat.MediaStyle()
.setShowActionsInCompactView(0)
.setMediaSession(mSession.getSessionToken()))
.setPriority(NotificationCompat.PRIORITY_MAX)
.setWhen(0)
.setOngoing(true);
startForeground(NOTIFICATION_ID, notification.build());
我正在创建一个锚点并将其添加到我的 ARSKView 在相机前面的一定距离处，如下所示：
func displayToken(distance: Float) {
print("token dropped at: \(distance)")
guard let sceneView = self.view as? ARSKView else {
return
}
// Create anchor using the camera's current position
if let currentFrame = sceneView.session.currentFrame {
// Create a transform with a translation of x meters in front of the camera
var translation = matrix_identity_float4x4
translation.columns.3.z = -distance
let transform = simd_mul(currentFrame.camera.transform, translation)
// Add a new anchor to the session
let anchor = ARAnchor(transform: transform)
sceneView.session.add(anchor: anchor)
}
} …我目前正在使用以下代码来查询用户在过去 24 小时内睡眠的小时数：
func getHealthKitSleep() {
let healthStore = HKHealthStore()
let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false)
// Get all samples from the last 24 hours
let endDate = Date()
let startDate = endDate.addingTimeInterval(-1.0 * 60.0 * 60.0 * 24.0)
let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: [])
// Sleep query
let sleepQuery = HKSampleQuery(
sampleType: HKObjectType.categoryType(forIdentifier: HKCategoryTypeIdentifier.sleepAnalysis)!,
predicate: predicate,
limit: 0,
sortDescriptors: [sortDescriptor]){ (query, results, error) -> Void in
if error != nil {return}
// Sum the sleep …