来自Objective-C的快速回调_Objective C_Swift_Callback_Delegates

来自Objective-C的快速回调

objective-c swift

来自Objective-C的快速回调,objective-c,swift,callback,delegates,Objective C,Swift,Callback,Delegates,在Swift应用程序中，我有一个视图控制器，它调用一个新的模式。此模式具有asViewControllerObjective-C实现为ViewController\u obj\u C 这个modal是从Swift代码中显示的，我想在Objective-C代码完成时调用callback属性（使用UIImage参数）我的回调属性“signCompleteCallback”不起作用。如何从Swift中填充回调属性并在Objective-C中调用它 SwiftViewController.swift:

在Swift应用程序中，我有一个

视图控制器

，它调用一个新的

模式

。此

模式

具有as

ViewController

Objective-C

实现为

ViewController\u obj\u C

这个

modal

是从Swift代码中显示的，我想在

Objective-C

代码完成时调用callback属性（使用UIImage参数）

我的回调属性“signCompleteCallback”不起作用。如何从

Swift

中填充回调属性并在

Objective-C

中调用它

SwiftViewController.swift:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = #selector(self.Test)
        }
    }
}

@objc func Test(image: UIImage)
{
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>


@property SEL signCompleteCallback;

- (IBAction)Done_Clicked:(id)sender;

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

   [self signCompleteCallback]; // Here is the point when I want to call me callback and as a parameter i want to send image
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>

    @property (nonatomic, strong) id <ObjC_ManagerDelegate>delegate;

    - (IBAction)Done_Clicked:(id)sender;
@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [self.delegate signCallBack:image];
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.delegate = SwiftmanagerDelegate()
        }
    }
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = testMethod(image:) //`(image:)` is not needed when not ambiguous
        }
    }
}

func testMethod(image: UIImage) {
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController<UIPopoverPresentationControllerDelegate>

typedef void (^signCompleteCallbackType)(UIImage * _Nonnull image); //Declare the block type

@property signCompleteCallbackType signCompleteCallback; //Declare the block property using the block type

- (IBAction)Done_Clicked:(id)sender;

@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    self.signCompleteCallback(image);    //Use the block just like a normal function
}

ViewController\u obj\u c.h:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = #selector(self.Test)
        }
    }
}

@objc func Test(image: UIImage)
{
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>


@property SEL signCompleteCallback;

- (IBAction)Done_Clicked:(id)sender;

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

   [self signCompleteCallback]; // Here is the point when I want to call me callback and as a parameter i want to send image
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>

    @property (nonatomic, strong) id <ObjC_ManagerDelegate>delegate;

    - (IBAction)Done_Clicked:(id)sender;
@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [self.delegate signCallBack:image];
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.delegate = SwiftmanagerDelegate()
        }
    }
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = testMethod(image:) //`(image:)` is not needed when not ambiguous
        }
    }
}

func testMethod(image: UIImage) {
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController<UIPopoverPresentationControllerDelegate>

typedef void (^signCompleteCallbackType)(UIImage * _Nonnull image); //Declare the block type

@property signCompleteCallbackType signCompleteCallback; //Declare the block property using the block type

- (IBAction)Done_Clicked:(id)sender;

@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    self.signCompleteCallback(image);    //Use the block just like a normal function
}

我找到了一个解决办法，但我对他不满意

如果有人提出更好的解决方案，我会为此感到高兴。在这个解决方案中，我不喜欢创建一个必须在Swift部件中继承的新协议（创建一个新类或在现有的SwiftViewcontroller中继承它都无所谓）

一种方法是在Objective-C中创建

@protocol

：

@protocol ObjC_ManagerDelegate 
-(void) signCallBack: (UIImage *)image;
@end

ViewController\u obj\u c.h:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = #selector(self.Test)
        }
    }
}

@objc func Test(image: UIImage)
{
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>


@property SEL signCompleteCallback;

- (IBAction)Done_Clicked:(id)sender;

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

   [self signCompleteCallback]; // Here is the point when I want to call me callback and as a parameter i want to send image
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>

    @property (nonatomic, strong) id <ObjC_ManagerDelegate>delegate;

    - (IBAction)Done_Clicked:(id)sender;
@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [self.delegate signCallBack:image];
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.delegate = SwiftmanagerDelegate()
        }
    }
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = testMethod(image:) //`(image:)` is not needed when not ambiguous
        }
    }
}

func testMethod(image: UIImage) {
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController<UIPopoverPresentationControllerDelegate>

typedef void (^signCompleteCallbackType)(UIImage * _Nonnull image); //Declare the block type

@property signCompleteCallbackType signCompleteCallback; //Declare the block property using the block type

- (IBAction)Done_Clicked:(id)sender;

@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    self.signCompleteCallback(image);    //Use the block just like a normal function
}

快速部分看起来像这样。创建一个新类并从

ObjC\u ManagerDelegate

继承它：

class SwiftmanagerDelegate: ObjC_ManagerDelegate {
    func signCallBack(_ image: UIImage!) {
        // do something
    } 
}

最后以委托的身份填充新类

SwiftViewController.swift:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = #selector(self.Test)
        }
    }
}

@objc func Test(image: UIImage)
{
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>


@property SEL signCompleteCallback;

- (IBAction)Done_Clicked:(id)sender;

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

   [self signCompleteCallback]; // Here is the point when I want to call me callback and as a parameter i want to send image
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>

    @property (nonatomic, strong) id <ObjC_ManagerDelegate>delegate;

    - (IBAction)Done_Clicked:(id)sender;
@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [self.delegate signCallBack:image];
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.delegate = SwiftmanagerDelegate()
        }
    }
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = testMethod(image:) //`(image:)` is not needed when not ambiguous
        }
    }
}

func testMethod(image: UIImage) {
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController<UIPopoverPresentationControllerDelegate>

typedef void (^signCompleteCallbackType)(UIImage * _Nonnull image); //Declare the block type

@property signCompleteCallbackType signCompleteCallback; //Declare the block property using the block type

- (IBAction)Done_Clicked:(id)sender;

@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    self.signCompleteCallback(image);    //Use the block just like a normal function
}

为什么不使用Objective-C block

SwiftViewController.swift:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = #selector(self.Test)
        }
    }
}

@objc func Test(image: UIImage)
{
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>


@property SEL signCompleteCallback;

- (IBAction)Done_Clicked:(id)sender;

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

   [self signCompleteCallback]; // Here is the point when I want to call me callback and as a parameter i want to send image
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>

    @property (nonatomic, strong) id <ObjC_ManagerDelegate>delegate;

    - (IBAction)Done_Clicked:(id)sender;
@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [self.delegate signCallBack:image];
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.delegate = SwiftmanagerDelegate()
        }
    }
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = testMethod(image:) //`(image:)` is not needed when not ambiguous
        }
    }
}

func testMethod(image: UIImage) {
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController<UIPopoverPresentationControllerDelegate>

typedef void (^signCompleteCallbackType)(UIImage * _Nonnull image); //Declare the block type

@property signCompleteCallbackType signCompleteCallback; //Declare the block property using the block type

- (IBAction)Done_Clicked:(id)sender;

@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    self.signCompleteCallback(image);    //Use the block just like a normal function
}

ViewController\u obj\u c.h:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = #selector(self.Test)
        }
    }
}

@objc func Test(image: UIImage)
{
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>


@property SEL signCompleteCallback;

- (IBAction)Done_Clicked:(id)sender;

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

   [self signCompleteCallback]; // Here is the point when I want to call me callback and as a parameter i want to send image
}

@interface ViewController_obj_c : UIViewController <UIPopoverPresentationControllerDelegate>

    @property (nonatomic, strong) id <ObjC_ManagerDelegate>delegate;

    - (IBAction)Done_Clicked:(id)sender;
@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [self.delegate signCallBack:image];
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.delegate = SwiftmanagerDelegate()
        }
    }
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showModalSegue" {
        if let nextVC = segue.destination as? ViewController_obj_c {

            nextVC.signCompleteCallback = testMethod(image:) //`(image:)` is not needed when not ambiguous
        }
    }
}

func testMethod(image: UIImage) {
    debugPrint("Test method was called as callback with image parameter")
}

@interface ViewController_obj_c : UIViewController<UIPopoverPresentationControllerDelegate>

typedef void (^signCompleteCallbackType)(UIImage * _Nonnull image); //Declare the block type

@property signCompleteCallbackType signCompleteCallback; //Declare the block property using the block type

- (IBAction)Done_Clicked:(id)sender;

@end

- (IBAction)Done_Clicked:(UIButton *)sender
{
    UIGraphicsBeginImageContext(_dV.bounds.size);
    [_dV.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    self.signCompleteCallback(image);    //Use the block just like a normal function
}