Question

我使用OC来自定义工具类，创建按钮工具，如何将此工具转换为swift代码？在行_buttonBlock = [button copy];中如何在swift中复制用户？

ToolView .h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface ToolView : NSObject

+ (instancetype)shendInstance;

- (void)createButtonWithFrame:(CGRect)rect superView:(UIView *)superView buttonBlock:(void(^)(UIButton *button))button;

@end

ToolView.m

#import "ToolView.h"

typedef void(^ButtonBlock)();

@interface ToolView(){
    ButtonBlock _buttonBlock;
}

@end

@implementation ToolView

+ (instancetype)shendInstance{
    static ToolView *toolview = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        toolview = [[ToolView alloc]init];
    });
    return toolview;
}

- (void)createButtonWithFrame:(CGRect)rect superView:(UIView *)superView buttonBlock:(void(^)(UIButton *button))button{
    _buttonBlock = [button copy];
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = rect;
    btn.backgroundColor = [UIColor orangeColor];
    [btn addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
    [superView addSubview:btn];
}

- (void)buttonAction:(UIButton *)sender{
    if (_buttonBlock) {
        _buttonBlock(sender);
    }
}

@end

Answer 1

在行_buttonBlock = [按钮复制];如何在swift中复制用户？

您不要在Swift中复制块参数，而是将参数标记为转义。你的Swift函数将被声明为：

fun createButton(frame: CGRect,
                 superView: UIView,
                 buttonBlock: @escaping (UIButton) -> Void
                )

请参阅The Swift Programming Language: Closures中的转义闭包。

Answer 2

我转换了它，我自己的代码如下：

ToolView.swift

import UIKit
class ToolView: NSObject {

    static let instance: ToolView = ToolView()
    class func shareInstance() -> ToolView{
        return instance
    }

    var blockActionBlock:((UIButton) -> Void)?

    func createButton(frame: CGRect, superView: UIView, buttonBlock: @escaping (UIButton) ->Void) -> Void { //
        let button = UIButton()
        button.frame = frame
        button.backgroundColor = UIColor.red
        superView .addSubview(button)
        button .addTarget(self, action: #selector(self.buttonAction), for: UIControlEvents.touchUpInside)
        blockActionBlock = buttonBlock
    }

    @objc func buttonAction(sender: UIButton){
        blockActionBlock!(sender)
    }
}

ViewController.swift

import UIKit
class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        ToolView .shareInstance().createButton(frame: CGRect(x:100, y: 100, width:100, height:50), superView: self.view) { (button) in
            print("Click Button \(button)")
        }
    }
}

如何在代码下将OC转换为Swift4？

2 个答案: