实例方法

实例方法是在实例化实例后，在类的特定实例上可用的方法：

MyClass *instance = [MyClass new];
[instance someInstanceMethod];

这是你如何定义一个：

@interface MyClass : NSObject

- (void)someInstanceMethod; // "-" denotes an instance method

@end

@implementation MyClass

- (void)someInstanceMethod {
    NSLog(@"Whose idea was it to have a method called \"someInstanceMethod\"?");
}

@end