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一、 Self:相当于java里的this指针

1.应用场景：

2.在对象方法里的使用：指定的是当前对象

@interface Person :NSObject｛｝-（void) run;-(void) eat:(NSString *) footName;@end@implementation Person-（void) run{    @NSLog(@"somebody is running");}-(void) eat:(NSString *) footName{    @NSLog(@"somebody is eatting", footName);    //在此使用self    [self run];}@end

2）在主类里使用Person类

#import "person.h"int main(int argc, const char * argv[]){    @autoreleasepool {                Person *p = [Person new];        [p eat];    }    return 0;}

3.在类方法里的使用：指定的是当前类

@interface Person :NSObject｛｝+(void)walk;+(void)take:(NSString*) footName;@end@implementation Person+(void)walk{    NSLog(@"somebody is walking");}+(void)take:(NSString*) footName{    NSLog(@"somebody is taking %@", footName);    [self walk];}@end

2）在主类里使用Person类

#import "person.h"int main(int argc, const char * argv[]){    @autoreleasepool {         [Person take];        Person p= [Person new];        //打印类的地址  结果是两种都相同        NSLog(@"Person = %p",[Person class]);        NSLog(@"Person = %p",[p class]);    }    return 0;}

4.Self修饰变量

@interface Person : NSObject{
       @public    int _weight;}-(void) setWeight:(int) weight;-(int) getWeight;@end@implementation Person//在此处使用self-(void) setWeight:(int) weight{    self->_weight = weight;}-(int) getWeight{    return self->_weight;}@end

2）在主类里使用Person类

#import "person.h"int main(int argc, const char * argv[]){    @autoreleasepool {             Person p= [Person new];        [p setWeight:50];        int weight = [p getWeight];        NSLog(@"weight = %d",weight);    }    return 0;}

5.总结：

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