Method body for a generic Obj-C method with a completion block

Question

I love using animateWithDuration:options:completion. I have come across a few situations where I could really use this for my own scenario without an animation, but I am having difficulty writing the method body out. Obviously I can't just look at the UIView's code, only it's signatures.

Here was my attempt (I may have the method signatures all messed up too):

.h
+(void)performGenericBlock:(void(^)(BOOL))code actionWhenDone:(void(^)(void))action;

.m
+(void)performGenericBlock:(void(^)(BOOL))code actionWhenDone:(void(^)(void))action
{
   //Kind of lost here - here is psuedocode
   [do stuff:^(BOOL done){action}];
}

Basically I want to accomplish:

Perform the first block of code, when it is done, do the second block of code.

Answer 1

Not sure why you need two arguments, you should be able to just write the code in the original block.

In the following examples, assume we want to first call [self.test foo1] then [self.test foo2].

The simplest solution is to not create a new method at all. Simply call your code:

[self.test foo1];
[self.test foo2];

foo2 will be performed after foo1.

The second simplest solution is to create the function with only one argument:

[ViewController performGenericBlock:^{
    [self.test foo1];
    [self.test foo2];
}];

If you really do need 2 arguments, you would do the following:

[ViewController performGenericBlock:^{
    [self.test foo1];
} actionWhenDone:^{
    [self.test foo2];
}];

... and define the method like so:

+ (void)performGenericBlock:(void(^)(void))code actionWhenDone:(void(^)(void))action {
    code();
    action();
}