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Dispatch main screen scale to main once and only once

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fixes #183
This commit is contained in:
Ryan Nystrom 2015-01-08 14:24:34 -08:00
parent 42f801f269
commit e60b51bbbf
1 changed files with 15 additions and 8 deletions
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23
AsyncDisplayKit/ASDisplayNode.mm
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@ -51,18 +51,25 @@ CGFloat ASDisplayNodeScreenScale()
{ {
static CGFloat screenScale = 0.0; static CGFloat screenScale = 0.0;
static dispatch_once_t onceToken; static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{ ASDispatchOnceOnMainThread(&onceToken, ^{
if ([NSThread isMainThread]) { screenScale = [[UIScreen mainScreen] scale];
screenScale = [[UIScreen mainScreen] scale];
} else {
dispatch_sync(dispatch_get_main_queue(), ^{
screenScale = [[UIScreen mainScreen] scale];
});
}
}); });
return screenScale; return screenScale;
} }
void ASDispatchOnceOnMainThread(dispatch_once_t *predicate, dispatch_block_t block)
{
if ([NSThread isMainThread]) {
dispatch_once(predicate, block);
} else {
if (DISPATCH_EXPECT(*predicate == 0L, NO)) {
dispatch_sync(dispatch_get_main_queue(), ^{
dispatch_once(predicate, block);
});
}
}
}
void ASDisplayNodePerformBlockOnMainThread(void (^block)()) void ASDisplayNodePerformBlockOnMainThread(void (^block)())
{ {
if ([NSThread isMainThread]) { if ([NSThread isMainThread]) {