iPhone - a delay between operations in the queue

Question

I am adding operations to the queue using something like this

NSInvocationOperation *operation0 = [[NSInvocationOperation alloc] 
initWithTarget:self
selector:@s         


        

Answer 1

I have two ways to do such thing.

First: Let the current thread to sleep on the tail of doStuff1, doStuff2, and doStuff3.

Second: Sub-class NSOperation and override the method -(void)main. You can init a custom NSOperation with parameters of target and action like following:

-(id)initWithTarget:(id)target action:(SEL)action;

And execute this action of target in the -(void)main by

[target performSelector:action];
[NSThread sleepForTimeInterval:0.05];