Question

嗨，在我的应用程序中，我有一个数组。因为我有很多UIView和UIImageView组件，我想从该数组中获取每个组件，并且必须知道是图像视图还是视图，如果是imageview，我必须更改该图像的图像。但我没有任何想法如何知道组件是imageview或视图。如果有人知道，请告诉我识别组件类型的方法。请帮我解决这个问题。

for (int i=0; i<[array count]; i++){
   // here i have to know wether the component is imageview or view and based on that i have to do below operations 
   UIView *view1=[array objectAtIndex:i];
   NSLog(@"%@",[array objectAtIndex:i]);
   if (130==view1.tag){
       view1.backgroundColor=[UIColor redColor];
    }
    UIImageView *image1=[array objectAtIndex:i];
    if (132==image1.tag){
       image1.image=[UIImage imageNamed:@"Approve2.png"];
    }
}

Answer 1

使用isKindOfClass

示例：

if ( [originalValue isKindOfClass:[UIImageView class]] ){

   UIImageView *myImageView = (UIImageView *)originalValue;

}

Answer 2

您可以通过班级内省检查

试试这个

if( [obj1 class] == [obj2 class] ){

   //same class
}

你可能感觉很方便的其他东西

Class Introspection
·  Determine whether an objective-C object is an instance of a class
        [obj isMemberOfClass:someClass];
·  Determine whether an objective-C object is an instance of a class or its descendants
        [obj isKindOfClass:someClass];
·  The version of a class
        [MyString version]
·  Find the class of an Objective-C object
        Class c = [obj1 class]; 
        Class c = [NSString class];
·  Verify 2 Objective-C objects are of the same class
        [obj1 class] == [obj2 class]

如何检查组件是UIView还是UIImageView

2 个答案: