更改表格视图中默认删除图标的颜色

Question

我正在寻找一种在表格处于编辑模式时将默认删除图标颜色从红色更改为蓝色的方法。

左边的红色图标是我所说的，是在将表格视图设置为编辑模式时的默认设置。

Answer 1

最好把红色图片_system.remove改成自己的蓝色图片。

func swizzle() {

    guard let cls = NSClassFromString("UITableViewCellEditControl") else { return }
    let originalSelector = NSSelectorFromString("_updateImageView")
    let swizzledSelector = #selector(UIView._updateImageViewHijack)
    let originMethod = class_getInstanceMethod(cls, originalSelector)
    let swizzleMethod = class_getInstanceMethod(UIView.self, swizzledSelector)
    if let swizzledMethod = swizzleMethod, let originalMethod = originMethod{
        method_exchangeImplementations(originalMethod, swizzledMethod)
    }
    
    
    let originalS = NSSelectorFromString("layoutSubviews")
    let swizzledS = #selector(UIView.layoutSubviewsHijack)
    let originM = class_getInstanceMethod(cls, originalS)
    let swizzleM = class_getInstanceMethod(UIView.self, swizzledS)
    if let swizzledM = swizzleM, let originalM = originM{
        method_exchangeImplementations(originalM, swizzledM)
    }
}
        



extension UIView{
    @objc func _updateImageViewHijack(){
        _updateImageViewHijack()
        for v in subviews{
            if let img = v as? UIImageView{
                img.image = UIImage(named: "one.png")
            }
        }
        
    }
    
    
    @objc func layoutSubviewsHijack(){
        layoutSubviewsHijack()
        for v in subviews{
            if let img = v as? UIImageView{
                img.image = UIImage(named: "one.png")
            }
        }
    }
}

swizzle() 只能调用一次。

结果：

---

怎么知道UITableViewCellEditControl？

---

如何知道UITableViewCellEditControl的方法？

通过runtime

                var count: UInt32 = 0
                guard let methodArr = class_copyMethodList(NSClassFromString("UITableViewCellEditControl"), &count) else { return }
                
                let cnt = Int(count)
                for i in 0..<cnt{
                    let method = methodArr[i]
                    let name = method_getName(method)
                    if let type = method_getTypeEncoding(method){
                        print(name, String(utf8String: type) ?? " _ | _ ")
                    }
                }

---

如何知道图片_system.remove的大小？

和