All these answers are great. Thanks
On Aug 24, 2011, at 9:01 PM, Graham Cox wrote:
>
> On 25/08/2011, at 10:46 AM, Brad Stone wrote:
>
>> I need to call this method manually but I'm confused how to format the
>> completionHandler. I don't understand what I'm reading. Can anyone give me
>> an example of how to define the completionHandler or point me to some
>> documentation?
>>
>> [self saveToURL:[self fileURL] ofType:@"myDocType"
>> forSaveOperation:NSAutosaveInPlaceOperation completionHandler:^(I'm
>> confused!!!)];
>>
>> This is the method definition
>> - (void)saveToURL:(NSURL *)url ofType:(NSString *)typeName
>> forSaveOperation:(NSSaveOperationType)saveOperation completionHandler:(void
>> (^)(NSError *errorOrNil))completionHandler
>>
>> I've used blocks before like below but I don't understand the syntax above
>> and I couldn't find an example on the internet or the documentation. Any
>> help would be appreciated.
>> [openPanel beginSheetModalForWindow:[NSApp keyWindow]
>> completionHandler:^(NSInteger theResult) {
>> if (theResult) {
>> // some code here
>> }
>
>
> Separate the block definition from the calling method to make it clearer:
>
>
> void (^completionHandler)(NSError*) = ^(NSError* error)
> {
> // here, write the code that makes up the body of the completion handler
>
>
> }
>
> [self saveToURL:[self fileURL] ofType:@"myDoc" forSaveOperation:saveOp
> completionHandler:completionHandler];
>
>
> Here we just named the block 'completionHandler', but it could be anything,
> such as 'fred' - it's just a variable identifier.
>
>
>
> --Graham
>
>
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