循环遍历NSArray objectAtIndex

Question

NSInteger *count = [monLessonArrayA count]; for (i = 0; i < count; i++) { arrayVar = [monLessonArrayA objectAtIndex:i]; }

I get an error saying i is undeclared, how can I set the objectAtIndex to i so I can loop through increasing it each time?

Thanks.

Answer 1

Because your i is undeclared.

for (int i = 0; i < count; i++)

Also, you don't need the * for your NSInteger .

NSInteger count = [monLessonArrayA count]; 

Answer 2

在循环中使用它之前，您只是忘了声明i （及其数据类型）：

for (int i = 0; i < count; i++) {

Answer 3

You can also use fast enumeration, which is actually faster:

for (id someObject in monLessonArrayA) {
    // Do stuff
}