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Reduce +[UIImage imageNamed:] overhead

This commit is contained in:
Nick Lockwood 2015-08-10 17:42:32 -01:00
parent 7750db05e6
commit 1d072076db
1 changed files with 23 additions and 13 deletions
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36
React/Base/RCTConvert.m
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@ -664,12 +664,29 @@ RCT_CGSTRUCT_CONVERTER(CGAffineTransform, (@[
NSURL *URL = [self NSURL:path];
NSString *scheme = [URL.scheme lowercaseString];
if ([scheme isEqualToString:@"file"]) {
if ([NSThread currentThread] == [NSThread mainThread]) {
// Image may reside inside a .car file, in which case we have no choice
// but to use +[UIImage imageNamed] - but this method isn't thread safe
image = [UIImage imageNamed:path];
if (path && [scheme isEqualToString:@"file"]) {
if (RCT_DEBUG || [NSThread currentThread] == [NSThread mainThread]) {
if ([URL.path hasPrefix:[[NSBundle mainBundle] resourcePath]]) {
// Image may reside inside a .car file, in which case we have no choice
// but to use +[UIImage imageNamed] - but this method isn't thread safe
static NSMutableDictionary *XCAssetMap = nil;
if (!XCAssetMap) {
XCAssetMap = [[NSMutableDictionary alloc] init];
}
NSNumber *isAsset = XCAssetMap[path];
if (!isAsset || isAsset.boolValue) {
image = [UIImage imageNamed:path];
if (RCT_DEBUG && image) {
// If we succeeded in loading the image via imageNamed, and the
// method wasn't called on the main thread, that's a coding error
RCTAssertMainThread();
}
}
if (!isAsset) {
// Avoid calling `+imageNamed` again in future if it's not needed.
XCAssetMap[path] = @(image != nil);
}
}
}
if (!image) {
@ -680,13 +697,6 @@ RCT_CGSTRUCT_CONVERTER(CGAffineTransform, (@[
image = [UIImage imageWithContentsOfFile:path];
}
// We won't warn about nil images because there are legitimate cases
// where we find out if a string is an image by using this method, but
// we do enforce thread-safe API usage with the following check
if (RCT_DEBUG && !image && [UIImage imageNamed:path]) {
RCTAssertMainThread();
}
} else if ([scheme isEqualToString:@"data"]) {
image = [UIImage imageWithData:[NSData dataWithContentsOfURL:URL]];
} else {