无法将频道保存到PFInstallation（iOS） [英] Unable to save channels to PFInstallation (iOS)

问题描述

我正在尝试添加/删除PFInstallation中的频道，但我一直收到相同的错误消息：

I'm trying to add / remove channels from PFInstallation but I keep getting the same error message:

   Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Operation is invalid after previous operation.'

我的代码：

NSString * channel=[NSString stringWithFormat:@"%@%@%@", city, @"_", self.titleLabel.text];
PFInstallation *currentInstallation = [PFInstallation currentInstallation];
if([sender isOn]){
    [currentInstallation addUniqueObject:channel forKey:@"channels"];
} else{
    [currentInstallation removeObject:channel forKey:@"channels"];
}
[currentInstallation saveInBackground];

推荐答案

addUniqueObject方法有一个错误，当频道是零。
你应该在它之前加上它。

There is a bug in addUniqueObject method, when channels is nil. You should add this before it.

if (currentInstallation.channels == nil)
{
    currentInstallation.channels = [[NSArray alloc] init];
}

此外，你应该使用saveEventually而不是saveInBackGround。

Also, you should use saveEventually instead of saveInBackGround.

这应该是SDK中的错误。

This should be a bug in SDK.

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