Questions:
a) Why does the first code snippet call the completion block "immediately"?
b) If you assume A's answer is logical and correct, why does adding a
completion block to the inner transaction affect the outer?
Something seems wrong here.
Code:
[CATransaction begin];
[CATransaction setCompletionBlock:^{
NSLog(@"Completion block");
}];
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:1.0]
forKey:kCATransactionAnimationDuration];
layer.position = p;
[CATransaction commit];
[CATransaction commit];
NSLog(@"After commit");
Result:
0.000 seconds - After commit
0.002 seconds - Completion block
Code:
[CATransaction begin];
[CATransaction setCompletionBlock:^{
NSLog(@"Completion block");
}];
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:1.0]
forKey:kCATransactionAnimationDuration];
[CATransaction setCompletionBlock:^{
NSLog(@"Inner completion block");
}];
layer.position = p;
[CATransaction commit];
[CATransaction commit];
NSLog(@"After commit");
Result:
0.000 seconds - After commit
1.000 seconds - Inner completion block
1.000 seconds - Completion block
--
Seth Willits
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