測量方法執行時間的iOS工具：MRTimer

這是一個簡單的工具用來測量方法執行的時間。

- (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];
}</pre> 
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