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Change data compare statement when do animated data comparation

This commit is contained in:
zhongwuzw 2018-09-03 16:34:17 +08:00
parent 759b7322c9
commit 3dc5b0ab67
1 changed files with 2 additions and 2 deletions
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4
SDWebImage/SDAnimatedImageView.m
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@ -637,9 +637,9 @@ static NSUInteger SDDeviceFreeMemory() {
// If current data is the same data (or instance) as previous data // If current data is the same data (or instance) as previous data
self.isProgressive = YES; self.isProgressive = YES;
} else if (currentData.length > previousData.length) { } else if (currentData.length > previousData.length) {
// If current data is appended by previous data, use `NSDataSearchAnchored` // If current data is appended by previous data, use `NSDataSearchAnchored`, search is limited to start of currentData
NSRange range = [currentData rangeOfData:previousData options:NSDataSearchAnchored range:NSMakeRange(0, previousData.length)]; NSRange range = [currentData rangeOfData:previousData options:NSDataSearchAnchored range:NSMakeRange(0, previousData.length)];
if (range.location == 0) { if (range.location != NSNotFound) {
// Contains hole previous data and they start with the same beginning // Contains hole previous data and they start with the same beginning
self.isProgressive = YES; self.isProgressive = YES;
} }