关于传递实例变量的非常非常基本的 Obj-C 问题

发布于 2024-10-06 17:34:30 字数 356 浏览 2 评论 0原文

嗨，很抱歉问了这么愚蠢的问题我正在根据分段控件的索引更改变量值，但随后希望在接下来的计算中使用该变量；我确定这与变量作用域有关吗？

- (IBAction)calculate:(UIButton *)button {
if( [sSeg selectedSegmentIndex]==1){
    float  s=0.5;
    NSLog(@"s=%f", s);
}
else if ([sSeg selectedSegmentIndex]==0)
{
    float s=1; 
    NSLog(@"s=%f", s);
}
NSLog(@”s now = %f”, s);

！

非常感谢帮助

原文

Hi sorry about such a dumb question
I am changing a variable value depending on the index of a segmented control but then want to use this variable in a calculation that follows; am sure this has something to do with variable scoping?

- (IBAction)calculate:(UIButton *)button {
if( [sSeg selectedSegmentIndex]==1){
    float  s=0.5;
    NSLog(@"s=%f", s);
}
else if ([sSeg selectedSegmentIndex]==0)
{
    float s=1; 
    NSLog(@"s=%f", s);
}
NSLog(@”s now = %f”, s);

}

Help much appreciated!

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抱猫软卧 2024-10-13 17:34:31

- (IBAction)calculate:(UIButton *)button {
    float s = 0;
    if( [sSeg selectedSegmentIndex]==1){
        s=0.5;
        NSLog(@"s=%f", s);
    }
    else if ([sSeg selectedSegmentIndex]==0)
    {
        s=1; 
        NSLog(@"s=%f", s);
    }
    NSLog(@”s now = %f”, s);

是的

，它的范围 - 变量仅在大括号内可见。

- (IBAction)calculate:(UIButton *)button {
    float s = 0;
    if( [sSeg selectedSegmentIndex]==1){
        s=0.5;
        NSLog(@"s=%f", s);
    }
    else if ([sSeg selectedSegmentIndex]==0)
    {
        s=1; 
        NSLog(@"s=%f", s);
    }
    NSLog(@”s now = %f”, s);

}

Yeah, its the scope - a variable is only visible inside your curly brackets.

回复收藏 0 原文

合久必婚 2024-10-13 17:34:31

- (IBAction)calculate:(UIButton *)button {
    float s;
    if( [sSeg selectedSegmentIndex]==1){
        s=0.5;
        NSLog(@"s=%f", s);
    }
    else if ([sSeg selectedSegmentIndex]==0)
    {
        s=1; 
        NSLog(@"s=%f", s);
    }
    NSLog(@”s now = %f”, s);
}

- (IBAction)calculate:(UIButton *)button {
    float s;
    if( [sSeg selectedSegmentIndex]==1){
        s=0.5;
        NSLog(@"s=%f", s);
    }
    else if ([sSeg selectedSegmentIndex]==0)
    {
        s=1; 
        NSLog(@"s=%f", s);
    }
    NSLog(@”s now = %f”, s);
}

回复收藏 0 原文

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