判断对象类型
-(BOOL) isKindOfClass: classObj判断是否是这个类或者这个类的子类的实例
-(BOOL) isMemberOfClass: classObj 判断是否是这个类的实例
测试实例:
新建Person类继承NSObject,新建Teacher类继承Person
新建Person类:
#import <Foundation/Foundation.h> @interface Person : NSObject
{
NSString *name;
}
-(void)setName:(NSString*)n; @end
#import "Person.h" @implementation Person
-(void)setName:(NSString *)n
{
name = n;
} @end
新建Teacher类
#import "Person.h" @interface Teacher : Person -(void)teach; @end
#import "Teacher.h" @implementation Teacher
-(void)teach
{
NSLog(@"我教数学");
}
@end
我们先试验isMemberOfClass方法:
Person *person = [[Person alloc] init];
Teacher *teacher = [[Teacher alloc] init]; //YES
if ([teacher isMemberOfClass:[Teacher class]]) {
NSLog(@"teacher Teacher类的成员");
}
//NO
if ([teacher isMemberOfClass:[Person class]]) {
NSLog(@"teacher Person类的成员");
}
//NO
if ([teacher isMemberOfClass:[NSObject class]]) {
NSLog(@"teacher NSObject类的成员");
}
打印结果:
-- ::07.965 ObjectiveCTest[:f803] teacher Teacher类的成员 只有第一个判断打印出来，isMemberOfClass判断是否是属于这类的实例，是否跟父类有关系他不管。
isKindOfClass方法
Person *person = [[Person alloc] init];
Teacher *teacher = [[Teacher alloc] init]; //YES
if ([teacher isKindOfClass:[Teacher class]]) {
NSLog(@"teacher 是 Teacher类或Teacher的子类");
}
//YES
if ([teacher isKindOfClass:[Person class]]) {
NSLog(@"teacher 是 Person类或Person的子类");
}
//YES
if ([teacher isKindOfClass:[NSObject class]]) {
NSLog(@"teacher 是 NSObject类或NSObject的子类");
}
打印结果:
2017-05-26 11:15:17.315 ObjectiveCTest[2595:f803] teacher 是 Teacher类或Teacher的子类
2017-05-26 11:15:17.316 ObjectiveCTest[2595:f803] teacher 是 Person类或Person的子类
2017-05-26 11:15:17.316 ObjectiveCTest[2595:f803] teacher 是 NSObject类或NSObject的子类
三个结果都打印出来了。