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When you tap a row in a UITableView, the row is highlighted and selected. Is it possible to disable this so tapping a row does nothing?

並發的意思就是同時運行多個任務，這些任務可以在單核CPU上以分時(時間共享)的形式同時運行，或者在多核CPU上以真正的並行來運行多任務。

Documentation says that parent SKView object has a paused property. Set it to YES to pause the scene.

Paused

Lets say that you have a particle already created called MyParticle.sks.

First, you have to create a SKEmitterNode with your particle:

You can use this code to flip among x-axis:

spriteNode.xScale = spriteNode.xScale *-1;

but be careful you can lose some of physicsbody's property, I highly suggest u to use xScale in this way:

Maybe queuing the contacts and handle then in -update is what you need. For example:

Declare an instance variable called NSMutableArray *_contactQueue; Add the contacts to the array:

今天尝试着在一个ViewController上面调用：

You are using :

[self.navigationController popToRootViewControllerAnimated:TRUE];

This will bring you back to root view controller. If you want to navigate back to previous view controller,you should implement :

如何调整这个模拟器的大小。 command + R  模拟器运行后， 再按 command +1、 command+2、 command+3， 试试看。 你会发现 模拟器的大小发生了变化。