Calling [self methodName] from inside a block?
The accepted answer is outdated. Using __block
in that case can cause errors!
To avoid this problem, it’s best practice to capture a weak reference to self
, like this:
- (void)configureBlock {
XYZBlockKeeper * __weak weakSelf = self;
self.block = ^{
[weakSelf doSomething]; // capture the weak reference
// to avoid the reference cycle
}
}
Please, look at Apple Documentation - Avoid Strong Reference Cycles when Capturing self for more details.
Yes, you can do this.
Note, however, that the block will retain self
. If you end up storing this block in an ivar, you could easily create a retain cycle, which means neither would ever get deallocated.
To get around this, you can do:
- (void) someMethodWithAParameter:(id)aParameter {
__block MySelfType *blocksafeSelf = self;
void (^tempFunction)(void) = ^ {
[blocksafeSelf changeWindow:game];
};
[self doSomethingWithBlock:tempFunction];
}
The __block
keyword means (among other things) that the referenced object will not be retained.
__block CURRENTViewController *blocksafeSelf = self;
[homeHelper setRestAsCheckIn:strRestId :^(NSObject *temp) {
[blocksafeSelf YOURMETHOD:params];
}];