Using blocks in objective-c iOS7 and iOS8

blocks are a godsend and still people are reserved in using it. Perhaps it is because they don't know how to set it up. Here is a quick example on how to set it up.

In the .h file of whatever you are creating, make a new typedef for the block;

typedef void(^myCompletion)(BOOL complete);

This line shows that this is a "myCompletion" block and has one value going into it which a bool called complete. 

Next in the .h file create the method you want with a completion block;

-(void)doMyStuff withCompletion:(myCompletion)compBlock;

Now all you have to do is create it in your .m file;

-(void)doMyStuff withCompletion:(myCompletion)compBlock{

     //do the stuff you want to do 

     if (compBlock != nil) {

         compBlock(YES);

     }

}

This will do the method and then check if the compBlock is nil (protection) and if it is not nil, perform that block of functions as well. 

Technically you can do the block anywhere in the code, I am just using completion as an example since most of the time, that is where it is used. 

Now you actually want to use this method? Simple;

[myMethod doMyStuff withCompletion:^(BOOL complete) {

     if (complete){

          self.navController.topViewController.navigationItem.titleView = logoView; 

     }

}];

and there you have it. 

if you want another version, you can look here.

Stanford also has a nice video about using existing blocks here.

Grabbing call notifications in iOS7

Looks like there is not much in the way of documentation for how to do this so I am going to create one here.

Sometimes people get calls on their phone, I know this is crazy but it can happen. What you should do about it is up to you but how can you let your app know when this happens? Well I can help with that.

in your .h file, add the following.

#import <CoreTelephony/CTCallCenter.h>

@property (nonatomic, strong) CTCallCenter* callCenter;

you need to set the property as if you don't have anything holding on to the connection, it will disappear on your. Gotta love ARC!

in the .m file, here is your master method;

#pragma mark - phone call interrupts

-(void) setupPhoneNotification{

    float static playerVolume;

    self.callCenter = [[CTCallCenter alloc] init];

    self.callCenter.callEventHandler=^(CTCall* call)

    {

        

        if(call.callState == CTCallStateDialing)

        {

            //The call state, before connection is established, when the user initiates the call.

            NSLog(@"Call is dailing");

        }

        if(call.callState == CTCallStateIncoming)

        {

            //The call state, before connection is established, when a call is incoming but not yet answered by the user.

            NSLog(@"Call is Coming");

        }

        

        if(call.callState == CTCallStateConnected)

        {

            //The call state when the call is fully established for all parties involved.

            NSLog(@"Call Connected");

        }

        

        if(call.callState == CTCallStateDisconnected)

        {

            //The call state Ended.

            NSLog(@"Call Ended");

        } 

    };

}

And there you have it. Do whatever you need to do in the block, possibly send a trigger event or notifcation and then you are off to the races. Have fun!