我必须对导航栏进行快速着色,但要想改变颜色就变得越来越困难了。视图中的底色是我需要的最终结果,但是在viewDidLoad中设置这个颜色会导致结果不同。有人能给我指点方向吗?
override func viewDidLoad() {
super.viewDidLoad()
...
switch category {
case "Corn Management":
// color to be determined
break
case "Soybean Management":
我正在为我的解析曲面计算曲面法线。我得到的normal的某些部分是正确的,但不是全部。代码为:
SurfaceVertices3f[pos] = i;
SurfaceVertices3f[pos+1] = j;
SurfaceVertices3f[pos+2] = (cos(i)*sin(j));
/*a and b hold the poutput of partial differentiation of vertices from above three lines.a is wrt i and b is wrt j */
a[0]=1;
a[1]=0;
a[2]