Apple开发_NSString 使用 strong 与 copy 进行修饰的区别

测试代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    NSMutableString *m_notiion = [[NSMutableString alloc] init];
    m_notiion.string = @"房号密码的功能";
    self.m_notiion = m_notiion;
    [m_notiion appendString:@"加点文字"];

    CHLog(@"UIApplication == %@", self.m_notiion);
}

使用 strong 修饰

@interface GC_AppDelegate ()

@property(nonatomic, strong) NSString *m_notiion;

@end

• 结果

使用 copy 修饰

@interface GC_AppDelegate ()

@property(nonatomic, copy) NSString *m_notiion;

@end

• 结果