ios - 如何使用 CKModifyRecordsOperation.perRecordProgressBlock 更新进度
<p><p>这与最近的一个线程有关 <a href="https://stackoverflow.com/questions/29376714/update-progress-with-mrprogress/29377337#29377337" rel="noreferrer noopener nofollow">Update progress with MRProgress</a> .由于之前的线程(感谢 Edwin!)，我将我的 cloudkit 查询从便捷 API 转换为 CKOOperations。因此，在使用 CKModifyRecordsOperation 保存记录时，我可以通过登录 perRecordProgressBlock 来查看记录的进度，非常棒。但是，我正在尝试将此进度发送回 ViewController ，但我无法弄清楚如何做到这一点。我为我的所有 CloudKit 方法创建了一个类 - CKManager。我遇到的另一个问题是我不确定何时更新 VC 中的进度指示器(使用 MRProgress 框架)。我是在 CKManager 中的保存操作调用之前、期间还是之后调用它？是否应该递归调用直到进度== 1.0？这是我到目前为止的代码......除了更新/动画进度指示器(它出现并显示 0%，然后在保存操作完成后消失)之外，一切都很好。另外，我在我的 CKManager 类中使用了一个属性(双进度)，我知道这是不正确的，但我不知道该怎么做。而且我认为我在下面的 CKManager 类中为此声明/定义的回调方法也不正确。任何指导表示赞赏!</p>
<p>CKManager.h</p>
<pre><code>@property (nonatomic, readonly) double progress;
- (void)recordProgressWithCompletionHandler:(void (^)(double progress))completionHandler;
</code></pre>
<p>CKManager.m</p>
<pre><code> @property (nonatomic, readwrite) double progress;
- (void)recordProgressWithCompletionHandler:(void (^)(double))completionHandler {
completionHandler(self.progress);
}
- (void)saveRecord:(NSArray *)records withCompletionHandler:(void (^)(NSArray *, NSError *))completionHandler {
NSLog(@"INFO: Entered saveRecord...");
CKModifyRecordsOperation *saveOperation = [ initWithRecordsToSave:records recordIDsToDelete:nil];
saveOperation.perRecordProgressBlock = ^(CKRecord *record, double progress) {
if (progress <= 1) {
NSLog(@"Save progress is: %f", progress);
self.progress = progress;
}
};
saveOperation.perRecordCompletionBlock = ^(CKRecord *record, NSError *error) {
NSLog(@"Save operation completed!");
completionHandler(@, error);
};
;
}
</code></pre>
<p>Viewcontroller.m - 这是从相机获取照片并调用 CKManager 类以准备记录并将其保存到 CK 以及显示 MRProgress 指示器的方法...</p>
<pre><code>if (self.imageDataAddedFromCamera) {
self.hud = ;
self.hud.mode = MRProgressOverlayViewModeDeterminateCircular;
self.hud.titleLabelText = UPLOADING_MSG;
// prepare the CKRecord and save it
] withCompletionHandler:^(NSArray *records, NSError *error) {
if (!error && records) {
NSLog(@"INFO: Size of records array returned: %lu", (unsigned long));
CKRecord *record = ;
self.imageDataAddedFromCamera.recordID = record.recordID.recordName;
NSLog(@"INFO: Record saved successfully for recordID: %@", self.imageDataAddedFromCamera.recordID);
;
;
; // update the model with the new image
// update number of items since array set has increased from new photo taken
self.numberOfItemsInSection = ;
;
} else {
NSLog(@"Error trying to save the record!");
NSLog(@"ERROR: Error saving record to cloud...%@", error.localizedDescription);
;
;
;
}
}];
// where does this call belong?
[self.ckManager recordProgressWithCompletionHandler:^(double progress) {
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"Updating hud display...");
;
});
}];
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您应该在 saveRecord 调用中包含进度处理程序，如下所示:</p>
<pre><code>- (void)saveRecord:(NSArray *)records withCompletionHandler:(void (^)(NSArray *, NSError *))completionHandler recordProgressHandler:(void (^)(double))progressHandler {
NSLog(@"INFO: Entered saveRecord...");
CKModifyRecordsOperation *saveOperation = [ initWithRecordsToSave:records recordIDsToDelete:nil];
saveOperation.perRecordProgressBlock = ^(CKRecord *record, double progress) {
if (progress <= 1) {
NSLog(@"Save progress is: %f", progress);
progressHandler(progress)
}
};
saveOperation.perRecordCompletionBlock = ^(CKRecord *record, NSError *error) {
NSLog(@"Save operation completed!");
completionHandler(@, error);
};
;
}
</code></pre>
<p>然后你可以像这样调用那个保存记录:</p>
<pre><code> ] withCompletionHandler:^(NSArray *records, NSError *error) {
if (!error && records) {
NSLog(@"INFO: Size of records array returned: %lu", (unsigned long));
CKRecord *record = ;
self.imageDataAddedFromCamera.recordID = record.recordID.recordName;
NSLog(@"INFO: Record saved successfully for recordID: %@", self.imageDataAddedFromCamera.recordID);
;
;
; // update the model with the new image
// update number of items since array set has increased from new photo taken
self.numberOfItemsInSection = ;
;
} else {
NSLog(@"Error trying to save the record!");
NSLog(@"ERROR: Error saving record to cloud...%@", error.localizedDescription);
;
;
;
}
}, recordProgressHandler:^(double progress) {
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"Updating hud display...");
;
});
}];
</code></pre>
<p>因此，更新进度的代码是您的 saveRecord 调用的一部分。
上面的代码未经我测试。所以我希望我没有错字</p></p>
<p style="font-size: 20px;">关于ios - 如何使用 CKModifyRecordsOperation.perRecordProgressBlock 更新进度，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/29473336/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/29473336/
</a>
</p>
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