MRTimer is used to measure the method execution time.

The time interval can be simply retrieved within the method using setFlag and timeIntervalFromLastFlag:

[MRTimer setFlag];

[self doSomething];

NSTimeInterval interval = [MRTimer timeIntervalFromLastFlag];

Or jump out of the methods and use its observe style:

- (void)viewDidLoad 
{
    [super viewDidLoad];
    [MRTimer observeSelector:@selector(doSomething) timeIntervalBlock:^(NSTimeInterval interval) {
        NSLog(@"Time interval for selector: (%@, %f), NSStringFromSelector(doSomething), interval);
    }];
}

- (void)doSomething
{
    [MRTimer observeBegin:MR_SELECTOR];
    
    ...
    
    [MRTimer observeEnd:MR_SELECTOR];
}

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