override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { super.touchesBegan(touches, withEvent: event) let touch : UITouch = touches.anyObject() as UITouch if touch.view.isKindOfClass(UIPickerView) { } } if let picker = touch.view as? UIPicker { }
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BOOL res1 = [(id)[NSObject class]isKindOfClass:[NSObject class]];//1 BOOL res2 = [(id)[NSObject class]isMemberOfClass:[NSObject class]];//0 BOOL res3 = [(id)[LGPerson class]isKindOfClass:[LGPerson ...
if ([obj1 isKindOfClass:[NSString class]] && [obj2 isKindOfClass:[NSString class]]) { ChineseString *str1 = [[ChineseString alloc] initWithString:obj1]; ChineseString *str2 = [[ChineseString alloc]...
if ([annotation isKindOfClass:[MKPointAnnotation class]]) { static NSString *customReuseIndetifier = @"customReuseIndetifier"; CusAnnotationView *annotationView = (CusAnnotationView *)[mapView ...
([array isKindOfClass:[NSArray class]] || [array isKindOfClass:[NSMutableArray class]])) { NSLog(@"传入的参数不是数组类型"); return; } NSMutableArray *tmpArr = [array isKindOfClass:[NSMutableArray...
if ([subview isKindOfClass:NSClassFromString(@"UINavigationItemView")]) { for (UIButton *button in subview.subviews) { if ([button isKindOfClass:[UIBarButtonItem class]]) { button.frame = button....
} else if subview.isKindOfClass(UIBarButtonItem) { // 隐藏音量按钮 subview.hidden = true } } ``` 然而,自定义MPVolumeView并非简单地改变其外观,因为它是系统控件,很多属性和方法是私有的,无法直接...
if ([currentFirstResponder isKindOfClass:[UITextField class]] || [currentFirstResponder isKindOfClass:[UITextView class]]) { [currentFirstResponder resignFirstResponder]; } } ``` 这样,当用户...
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} else if ([result isKindOfClass:[NSDictionary class]]) { NSDictionary *dictResult = (NSDictionary *)result; // 处理字典 } ``` 除了sbjson,还有其他流行的JSON解析库,如“AFNetworking”的内置JSON解析...
} else if ([item isKindOfClass:[NewsImageItem class]]) { NewsImageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"NewsImageCell"]; cell.imageView.image = ((NewsImageItem *)item).image; ...
Runtime提供了反射能力,让我们能够在运行时检查对象的类型,如`object_isKindOfClass:`判断对象是否属于某个类,`-[NSObject isKindOfClass:]`是其面向对象的接口。此外,`-[NSObject performSelector:]`允许我们...
if ([jsonObject isKindOfClass:[NSDictionary class]]) { NSDictionary *dict = (NSDictionary *)jsonObject; // 处理解析后的字典数据 } else if ([jsonObject isKindOfClass:[NSArray class]]) { NSArray *...
} else if ([object isKindOfClass:[Employee class]]) { // Do something with an Employee object } ``` #### 五、内存管理 Objective-C 使用引用计数进行内存管理,你需要手动管理对象的引用。 1. **...
[key isKindOfClass:[NSString class]]) { NSLog(@"[AvoidCrash] Key must be non-nil and a string."); return; } if (!obj) { NSLog(@"[AvoidCrash] Object is nil, not setting key: %@", key); return; }...
} else if ([unarchivedObject isKindOfClass:[YourCustomClass class]]) { YourCustomClass *restoredObject = unarchivedObject; // 处理恢复的单个对象 } ``` 5. **安全注意事项**: - 归档和解档操作应该...
5. NSObject的内省方法:`init`是初始化方法,而`isKindOfClass:`和`responseToSelector:`是内省方法,`isMemberOfClass:`属于内省的一部分,但`init`不是。 6. 声明可选实现的函数:在声明协议时,使用`@optional`...
} else if ([jsonObject isKindOfClass:[NSDictionary class]]) { NSDictionary *dict = (NSDictionary *)jsonObject; // 处理字典内容 } } else { NSLog(@"Error parsing JSON: %@", error); } ``` 5. **编码...
if ([string isKindOfClass:[NSNull class]]) { NSLog(@"字符串是NULL"); } else if (string == nil) { NSLog(@"字符串是nil"); } else { NSLog(@"字符串非空"); } ``` 这适用于检查字符串是否为`NSNull`对象或`...
} else if ([person isKindOfClass:[Teacher class]]) { Teacher *teacher = (Teacher *)person; [teacher teach]; } } ``` 这个方法首先调用`sayHello`,然后根据对象的实际类型(是`Student`还是`Teacher`)...
if ([jsonObject isKindOfClass:[NSArray class]]) { self.dataList = jsonObject; dispatch_async(dispatch_get_main_queue(), ^{ [self.tableView reloadData]; }); } else { NSLog(@"Error parsing JSON: ...