The OSS iOS SDK provides a convenient synchronous API to check whether the specified object exists in the bucket.
Use the following code to determine whether an object exists:
NSError * error = nil;
BOOL isExist = [client doesObjectExistInBucket:TEST_BUCKET withObjectKey:@"file1m" withError:&error];
if (! error) {
if(isExist) {
NSLog(@"File exists.");
} else {
NSLog(@"File not exists.");
}
} else {
NSLog(@"Error!") ;
}