Performing selectors on main thread with NSInvocation
- by kpower
I want to perform animation on main thread (cause UIKit objects are not thread-safe), but prepare it in some separate thread. I have (baAnimation - is CABasicAnimation allocated & inited before):
SEL animationSelector = @selector(addAnimation:forKey:);
NSString *keyString = @"someViewAnimation";
NSInvocation *inv = [NSInvocation invocationWithMethodSignature:[workView.layer methodSignatureForSelector:animationSelector]];
[inv setTarget:workView.layer];
[inv setSelector:animationSelector];
[inv setArgument:baAnimation atIndex:2];
[inv setArgument:keyString atIndex:3];
[inv performSelectorOnMainThread:@selector(invoke) withObject:nil waitUntilDone:NO];
I get:
*** +[NSCFString length]: unrecognized selector sent to class 0x1fb36a0
Calls:
> #0 0x020984e6 in objc_exception_throw
> #1 0x01f7e8fb in +[NSObject doesNotRecognizeSelector:]
> #2 0x01f15676 in ___forwarding___
> #3 0x01ef16c2 in __forwarding_prep_0___
> #4 0x01bb3c21 in -[CALayer addAnimation:forKey:]
> #5 0x01ef172d in __invoking___
> #6 0x01ef1618 in -[NSInvocation invoke]
But [workView.layer addAnimation:baAnimation forKey:@"someViewAnimation"]; works fine. What am I doing wrong?
