从线程调用委托方法
我有这段代码：
- (IBAction)registerAction:(id)sender {
[NSThread detachNewThreadSelector:@selector(registerThread) toTarget:self withObject:nil];
}
- (void)registerThread {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
MyDelegate *delegate = (MyDelegate *)[[UIApplication sharedApplication] delegate];
NSInteger locationID = [delegate.api checkCoordinate:[NSString stringWithFormat:@"%f,%f",
location.coordinate.latitude, location.coordinate.longitude]];
NSNumber *status = [api registerWithUsername:usernameField.text
password:passwordField.text email:emailField.text andLocation:locationID];
[self performSelectorOnMainThread:@selector(registrationDoneWithStatus:) withObject:[NSNumber numberWithInt:1] waitUntilDone:NO];
[pool release];
}
它工作得很好，但有时我会得到这个错误：
void _WebThreadLockFromAnyThread(bool), 0x6157e30: Obtaining the web lock from a thread other than the main thread or the web thread. UIKit should not be called from a secondary thread.
而且似乎只有使用委托我才会得到这个错误，而且我不知道如何解决。
提前致谢 ：）
I've this bit of code:
- (IBAction)registerAction:(id)sender {
[NSThread detachNewThreadSelector:@selector(registerThread) toTarget:self withObject:nil];
}
- (void)registerThread {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
MyDelegate *delegate = (MyDelegate *)[[UIApplication sharedApplication] delegate];
NSInteger locationID = [delegate.api checkCoordinate:[NSString stringWithFormat:@"%f,%f",
location.coordinate.latitude, location.coordinate.longitude]];
NSNumber *status = [api registerWithUsername:usernameField.text
password:passwordField.text email:emailField.text andLocation:locationID];
[self performSelectorOnMainThread:@selector(registrationDoneWithStatus:) withObject:[NSNumber numberWithInt:1] waitUntilDone:NO];
[pool release];
}
it works nicely, but sometimes I get this error:
void _WebThreadLockFromAnyThread(bool), 0x6157e30: Obtaining the web lock from a thread other than the main thread or the web thread. UIKit should not be called from a secondary thread.
And it seems that only using the delegate I get this error, and I don't know how to resolve.
Thanks in advance :)
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评论（2）
我最近遇到了同样的问题。
可能有一些活动视图（例如
UITextField、UITextView）。在访问delegate之前尝试resignFirstResponder这些视图I've run into the same problem recently.
There may be some active views (eg.
UITextField,UITextView). TryresignFirstResponderthose views before accessingdelegate您可以通过非常仔细地考虑应用程序的并发架构并确保您没有从线程中执行任何只应在主线程上完成的操作来解决该问题。
在这种情况下，您将导致 UIKit 从辅助线程执行代码。如果您要在 _WebThreadLockFromAnyThread 上设置断点，您就会确切地知道在哪里。
除了最受严格控制的情况之外，从辅助线程使用应用程序的委托是非常不典型的。
tl;dr 您无法通过针对随机选择器分离新线程来使应用程序线程化。
You fix the problem by very carefully thinking through your application's concurrency architecture and ensuring that you aren't exercising anything from a thread that should only be done on the main thread.
In this case, you are causing the UIKit to execute code from a secondary thread. If you were to set a breakpoint on _WebThreadLockFromAnyThread, you would know exactly where.
It is exceedingly atypical to use the app's delegate from a secondary thread in anything but the most extremely controlled circumstances.
tl;dr You can't make an app threaded by detaching a new thread against a random selector.