objective-c - 指针和循环

Question

这个问题已经困扰我一段时间了:这两者之间有区别吗(例如在内存方面)

Pointer *somePointer;
for (...)
{
    somePointer = something;
    // do stuff with somePointer
}

还有这个

for (...)
{
    Pointer *somePointer = something;
    // do stuff with somePointer
}

Answer 1

如果你想在完成循环后使用指针，你需要做第一个。

Pointer *somePointer;
Pointer *somePointer2;
for(loopA)
{
    if(meetsSomeCriteria(somePointer)) break;
}

for(loopB)
{
    if(meetsSomeCriteria(somePointer2)) break; 
}
/* do something with the two pointers */
someFunc(somePointer,somePointer2);