关于 Objective-C 中的指针
我偶然发现了以下内容，似乎无法弄清楚为什么会这样。请您解释一下为什么我不需要在 range 之前使用指针？
NSString *d = @"The quick brown fox";
NSRange range = [d rangeOfString:@"brown"];
I stumbled across the following and can't seem to work out why this works. Please can you explain why I don't need to use a pointer before range?
NSString *d = @"The quick brown fox";
NSRange range = [d rangeOfString:@"brown"];
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NSString是一种对象类型。所有对象类型都是指针，不能在堆栈上创建。NSRange是一个 C 结构体。结构可以在堆栈上创建，因此不一定都是指针。没有一个好的指南来了解哪些是对象，哪些是结构。您只需在继续操作时检查每种类型即可。
NSStringis an object type. All object types are pointers and can't be created on the stack.NSRangeis a C-struct. Structs can be created on the stack, and thus aren't necessarily all pointers.There isn't a good guide to know which ones are objects, and which are structs. You'll just have to check for each type as you move forward.