- (BOOL)canShowUpdate:(NSString *)localVersion onlineVersion:(NSString *)onlineVersion{    if (![localVersion isEqualToString:onlineVersion]) {         NSArray *localArray = [localVersion componentsSeparatedByString:@"."];        NSArray *onlineArray = [onlineVersion componentsSeparatedByString:@"."];                NSUInteger length = localArray.count < onlineArray.count ? localArray.count : onlineArray.count;                for (NSUInteger index = 0 ; index < length; index++) {            if ([onlineArray[index] integerValue] > [localArray[index] integerValue] ) {                if(index >= 1){                    if ([onlineArray[index - 1] integerValue] >= [localArray[index - 1] integerValue]) {                        return YES;                    }                } else {                    return YES;                }            }        }                if (onlineArray.count > localArray.count) {            return YES;        }    }    return NO;}