objective-c的变量测试

最新推荐文章于 2025-11-10 09:11:43 发布

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本文通过一个Objective-C示例程序，详细介绍了如何在Objective-C中声明和使用实例变量，包括不同作用域变量的定义、内存管理和属性的合成。

//
//  main.m
//  varTest
//
//  Created by chenqy on 2016/12/5.
//  Copyright © 2016年 chenqy. All rights reserved.
//

#import <Foundation/Foundation.h>
@interface varTest :NSObject {
    NSString *a;
}

@property (nonatomic, assign) NSString *b;
@property (nonatomic, assign) NSString *c;//下面没有synthesize，在implemention中则需要下划线开始才能被调用
-(void)test;
@end

@implementation varTest{
    NSString *d;
}
@synthesize b;

-(NSString *) description{
    NSString *desc = [NSString stringWithFormat:@"%@,%@,%@,%@",a,b,_c,d];
    return desc;
}

-(void)test{
    a = @"123";
    b = @"456";
    _c = @"789";
    d = @"abc";
}
@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        NSLog(@"Hello, World!");
        varTest *vt = [[varTest alloc] init];
        vt.b = @"1";
        vt.c = @"2";
        NSLog(@"vt.b = %@，vt.c = %@",vt.b, vt.c);
        NSLog(@"vt = %@", vt);
        [vt test];
        NSLog(@"vt = %@", vt);
    }
    return 0;
}

结果：

2016-12-09 21:46:53.080048 varTest[3530:143174] Hello, World!

2016-12-09 21:46:53.080707 varTest[3530:143174] vt.b = 1，vt.c = 2

2016-12-09 21:46:53.080862 varTest[3530:143174] vt = (null),1,2,(null)

2016-12-09 21:46:53.080974 varTest[3530:143174] vt = 123,456,789,abc

Program ended with exit code: 0