CGFloat数组帮助-iPhone开发人员 [英] CGFloat array help - iPhone dev

问题描述

这是我的代码:

CGFloat components[8];//[8];// = {  0.6, 0.6, 0.6, 0.5, 0.4, 0.4, 0.4, 0.5 };
if ([appDelegate.graphType isEqualToString:@"response"])
{
    CGFloat components[8] = {  0.2, 0.2, 0.2, 0.5, 0.5, 0.5, 0.5, 0.5 };
}
else 
{
    if ([appDelegate.graphType isEqualToString:@"uptime"])
    {
        CGFloat components[8] = {  0.694, 0.855, 0.961, 0.5, 0.188, 0.588, 0.906, 0.5 };
    }
    else
    {
        CGFloat components[8] = {  0.694, 0.855, 0.961, 0.5, 0.188, 0.588, 0.906, 0.5 };
    }
}

所以基本上，我想根据不同的图形类型绘制不同的渐变.但是，xCode向我展示了if/else语句中的CGFloat components [8]未使用，并忽略了其值.任何想法是什么问题

So basically, I want to draw different gradients based on different graph types. However, xCode shows me that CGFloat components[8] from if/else statements is unused and ignores its values. Any ideas what is the problem

推荐答案

您要在每个if/else块中声明新的组件数组.您不想这样做，只想将值分配给已经声明的components数组即可.

You are declaring new components arrays in each if/else block. You don't want to do this, you just want to assign the values to the already declared components array.

类似的事情应该起作用:

Something like this should work:

CGFloat components[8];

const CGFloat components1[8] = {  0.2, 0.2, 0.2, 0.5, 0.5, 0.5, 0.5, 0.5 };
const CGGloat components2[8] = {  0.694, 0.855, 0.961, 0.5, 0.188, 0.588, 0.906, 0.5 };
const CGFloat components3[8] = {  0.694, 0.855, 0.961, 0.5, 0.188, 0.588, 0.906, 0.5 };

if ([appDelegate.graphType isEqualToString:@"response"])
{
    memcpy(components,components1, 8*sizeof(CGFloat));
}
else 
{
    if ([appDelegate.graphType isEqualToString:@"uptime"])
    {
             memcpy(components,components2, 8*sizeof(CGFloat));
    }
    else
    {
             memcpy(components,components3, 8*sizeof(CGFloat));
    }
}

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