从另一个视图控制器调用一个视图控制器的方法
方法“someMethod”，
@interface OneViewController
{
UIView *tempView;
..
}
-(void) someMethod ;
@end
我有一个在 OneViewController.h 中声明并在 OneViewController.m 文件中实现的
@implementation OneViewController
-(void) someMethod
{
tempView = [[UIView alloc]initWithFrame:CGRectMake(100, 50, 200, 250)];
tempView.backgroundColor = [UIColor yellowColor];
if([[self.view subviews] containsObject:tempView])
[tempView removeFromSuperView];
else
[self.view addsubview:tempView];
}
当出现在不同的 viewController - secondaryViewController 时，我想调用 someMethod
（类似于 [OneViewController someMethod])，这样当我返回 OneViewController 时，我可以看到 someMethod 所做的更改。
我需要使用 appDelegate 方法吗？
我已经尝试遵循但它不起作用。
neViewController *newViewController = [[OneViewController alloc] init];
[newViewController someMethod];
感谢您提前提供任何帮助..
I have a method "someMethod" declared in OneViewController.h
@interface OneViewController
{
UIView *tempView;
..
}
-(void) someMethod ;
@end
and implemented in OneViewController.m file
@implementation OneViewController
-(void) someMethod
{
tempView = [[UIView alloc]initWithFrame:CGRectMake(100, 50, 200, 250)];
tempView.backgroundColor = [UIColor yellowColor];
if([[self.view subviews] containsObject:tempView])
[tempView removeFromSuperView];
else
[self.view addsubview:tempView];
}
I want to call someMethod when present at different viewController - secondViewController
(something like [OneViewController someMethod]), So that when I get back to OneViewController I can see the changes made by someMethod.
Do I need to use appDelegate methods?
I have tried following but it doesn't work.
neViewController *newViewController = [[OneViewController alloc] init];
[newViewController someMethod];
Thanks for any help in advance..
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在 SecondViewController 中，声明 OneViewController 类的引用。您可以分配财产。在移动到 SecondViewController 之前设置引用。现在有了引用，您就可以调用实例方法
[_oneView someMethod]。编辑：
声明
同时添加分配属性，
在.m文件中综合变量。
从 OneViewController 显示 SecondViewController 时，只需添加以下行。
In the SecondViewController, declare a reference for OneViewController class. You can have assign property. Set the reference before you move to SecondViewController. Now with the reference, you can call the instance method
[_oneView someMethod].Edit:
Declare
Also add the assign property,
Synthesize the variable in .m file.
While showing the SecondViewController from OneViewController, just add the following line.
有时直接调用创建
[classObject methodName]的方法不会反映视图中的更改。就像如果您想将UIScrollView属性从scrollEnble = NO;更改为scrollEnable = YES;一样，它不会反映。您应该使用
UIApplication的单例。假设您想在
ViewController2中调用ViewController1的方法- (void)myMethod那么步骤如下：ViewController1并创建其对象*vc。 Delare 属性@property（强、非原子）ViewController1 *vc;。也合成。现在来到
Viewcontroller1类。在Viewcontroller1中导入AppDelegate.h并在viewDidLoad中编写如下：AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];appDelegate.vc1 = self;
ViewController2.h并导入AppDelegate.h转到您要调用的行
ViewController2的方法并这样写：AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];[[appDelegate vc1] myMethod]; // 允许滚动
sometimes calling a method directlry creating
[classObject methodName]does not refelect the changes in views. Like if you want to change aUIScrollViewproperty fromscrollEnble = NO;toscrollEnable = YES;, it does not refelect.You should use singleton of
UIApplication.Suppose you want to call
ViewController1's method- (void)myMethodinViewController2then here are the steps:ViewController1and create its object*vc. Delare property@property (strong, nonatomic) ViewController1 *vc;.synthesizealso.Now come to
Viewcontroller1class. ImportAppDelegate.hin youViewcontroller1's and inviewDidLoadwrite like this:AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];appDelegate.vc1 = self;
ViewController2.hand importAppDelegate.hGo to the line where you want to call
ViewController2's method and write like this:AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];[[appDelegate vc1] myMethod]; // to allow scrolling
理想情况下，您应该创建一个协议并委托方法来完成您正在寻找的任务。
创建一个协议，在 secondaryViewController 中实现它，并将协议委托设置为firstViewController，然后使用委托方法调用 secondaryViewController 中的相关方法
我希望它对你有用..!!
Ideally, you should create a protocol and delegate methods to accomplish what you are looking for.
Create a protocol, implement it in secondViewController and set the protocol delegate to firstViewController and then use the delegate methods for invoking the relevant methods in secondViewController
I hope it works for you..!!
一种方法是在 OneViewController.h 中将声明更改为
+(void) someMethod ;，并在实现文件中相应地将减号更改为加号。这将使其成为类方法而不是实例方法。然后在 SecondViewController.m 文件中，确保将@class OneViewController;放在实现声明之前；然后你可以调用 [OneViewController someMethod] 它应该执行。干杯!One way of doing it is to change the declaration to
+(void) someMethod ;in your OneViewController.h and change the minus to a plus correspondingly in the implementation file. This will make it a class-method and not an instance method. Then in your SecondViewController.m file, make sure to put@class OneViewController;before the implementation declaration; then you can call [OneViewController someMethod] and it should execute. Cheers!