Objective-C方法的声明实现及调用方法

@interface Person : NSObject
-(void) run;
@end

@implementation Person;
-(void)run{
    NSLog(@"我在跑步");
}
@end

int main(int argc, const char * argv[]) {
    Person *p = [Person new];
    [p run];
}

@interface Person : NSObject
-(void)eat:(NSString *)foodName;
@end

@implementation Person;
-(void)eat:(NSString *)foodName{
    NSLog(@"%@好美味!",foodName);
}
@end

int main(int argc, const char * argv[]) {
    Person *p = [Person new];
    [p eat:@"烤鱼"];
}

@interface Person : NSObject
-(int)sum:(int)num1 :(int)num2;
@end

@implementation Person;
-(int)sum:(int)num1 :(int)num2{
    int num = num1+num2;
    return num;
}
@end

int main(int argc, const char * argv[]) {
    Person *p = [Person new];
    NSLog(@"sum=%d",[p sum:1 :1]);
}

@interface MyClass : NSObject
@property (nonatomic, strong) NSString *name;
@property (nonatomic) NSInteger age;
@end
@implementation MyClass
- (NSString *)description {
    return [NSString stringWithFormat:@"MyClass: Name=%@, Age=%ld", self.name, (long)self.age];
}
@end

MyClass *myObject = [[MyClass alloc] init];
myObject.name = @"John";
myObject.age = 25;
NSLog(@"%@", myObject); // 输出: MyClass: Name=John, Age=25