English 中文(简体)
如何使用分割控件来定义整数?
原标题:How to use a segmented control to define integers?

我有三个数字,我已经定义了:

#define kBallSpeedX = 4;
#define kBallSpeedY = 3;
#define kCpuSpeed = 3.25;

但我希望当选择了部分控制器的另一部分时,这些数字会改变。 我该怎么做呢?

最佳回答

首先,你没有这样定义宏 - 它应该是:

#define kBallSpeedX 4
#define kBallSpeedY 3
#define kCpuSpeed 3.25

其次,你不应该真的使用宏 -- -- 使用实际变量(如果适当的话,使其相互一致),例如:

double kBallSpeedX = 4.0;
double kBallSpeedY = 3.0;
const double kCpuSpeed = 3.25;

您可以酌情修改 kBallSpeedX, kBallSpeedY 。

问题回答

暂无回答




相关问题
How to change out-of-focus text selection color in Xcode?

Okay, I ll bite. I ve got really pleasant code/window colors set up in Xcode. Ordinarily, my selection color is very visible. When I am doing a project search and iterating through the results, ...

Iphone NSTimer Issue

Hi I am new to objective c. I am trying to make an app for iphone. I have a button on my view, and the click on which the function playSound is called. This is working properly. It does plays the ...

Include a .txt file in a .h in C++?

I have a number of places where I need to re-use some template code. Many classes need these items In a .h could I do something like: #include <xxx.txt> and place all of this code in the ....

Iterating over string/strlen with umlauted characters

This is a follow-up to my previous question . I succeeded in implementing the algorithm for checking umlauted characters. The next problem comes from iterating over all characters in a string. I do ...

Xcode open two editor windows with same file

Is it possible to open the same file in two separate windows in Xcode. I can open a file in one window and the same file in the main Xcode editor window, but I wanted two separate fulltime editor ...

Forcing code signing refresh in Xcode

In our environment, we share resources across multiple projects and platforms. When building for iPhone, only a subset of those resources are needed. Since that subset is still considerable, we have ...

热门标签