iOS 8.3，键盘扩展Safari问题

Question

I'm making the iOS keyboard extension.

But When I do following code after button click in Safari Web, the proxy( UITextDocumentProxy ) stopped.

[self.textDocumentProxy adjustTextPositionByCharacterOffset:-5];//stop here
for (int i = 0; i < 10; i ++) {
    [self.textDocumentProxy deleteBackward];
}
[self.textDocumentProxy insertText:@"__________"];

It works well in safari-top-search-bar, but stop at other plain textbox.

dispatch_queue_t myQueue = dispatch_queue_create("com.test.online",0);
dispatch_async(myQueue, ^{
    [self.textDocumentProxy adjustTextPositionByCharacterOffset:-5];
    [NSThread sleepForTimeInterval:0.1];
    for (int i = 0; i < 10; i ++) {
        [self.textDocumentProxy deleteBackward];
    }
    [self.textDocumentProxy insertText:@"__________"];
});

If I put the block into dispatch_async on another queue with some delay after adjustTextPositionByCharacterOffset . It_works

However it makes my code slow in whole other apps also.

Any good idea? or Is there any way to detect whether it is Safari or Not?

Answer 1

I've experienced the same problem. It seems that if you do insertText or adjustTextPosition , you can't immediately call deleteBackward or adjustTextPosition . Our current workaround is to use NSTimer to delay for some time:

[self.textDocumentProxy adjustTextPositionByCharacterOffset:-5];
[self delayedDelete];

While delayedDelete could be like:

[NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(deleteBackward) userInfo:nil repeats:NO];

I'm thinking it's a bug of iOS and not documented yet.