swiftlint使用参考

https://www.jianshu.com/p/aaadbe445a3a
https://www.jianshu.com/p/a1afc52ec0ff

iOS替换AppIcon 参考

https://www.jianshu.com/p/86cd1251049c

Swift开发替换方法

1、OC开发的时候再+load中替换方法。swift开发没有load方法了，替换方法实现方式有两种
1.1使用OC
创建OC拓展文件， 将文件引入到混合开发桥接文件中

// 去掉切换AppIcon的弹框, 这里用的别人的代码。 文件名称是 UIViewController+YJPresent_NoAlert.h
#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIViewController (XZPresent_NoAlert)

@end

NS_ASSUME_NONNULL_END


// UIViewController+XZPresent_NoAlert.m

#import <objc/runtime.h>

@implementation UIViewController (XZPresent_NoAlert)

+ (void)load {
    
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Method presentM = class_getInstanceMethod(self.class, @selector(presentViewController:animated:completion:));
        Method presentSwizzlingM = class_getInstanceMethod(self.class, @selector(xz_presentViewController:animated:completion:));
        
        method_exchangeImplementations(presentM, presentSwizzlingM);
    });
}

- (void)xz_presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion {
    
    if ([viewControllerToPresent isKindOfClass:[UIAlertController class]]) {
        UIAlertController *alertController = (UIAlertController *)viewControllerToPresent;
        if (alertController.title == nil && alertController.message == nil) {
            return;
        }
    }
    
    [self xz_presentViewController:viewControllerToPresent animated:flag completion:completion];
}

@end

在桥接文件中引入

#import "UIViewController+YJPresent_NoAlert.h"

1.2使用swift方式替换方法
创建分类添加公共类方法实现替换
例1：

extension PhotoBrowserController {
    public class func initializeMethod(){
        let originalSelector = #selector(PhotoBrowserController.updateNavigation)
        let swizzledSelector = #selector(PhotoBrowserController.switchUpdateNavigation)

        let originalMethod = class_getInstanceMethod(self, originalSelector)
        let swizzledMethod = class_getInstanceMethod(self, swizzledSelector)

        //在进行 Swizzling 的时候,需要用 class_addMethod 先进行判断一下原有类中是否有要替换方法的实现
        let didAddMethod: Bool = class_addMethod(self, originalSelector, method_getImplementation(swizzledMethod!), method_getTypeEncoding(swizzledMethod!))
        //如果 class_addMethod 返回 yes,说明当前类中没有要替换方法的实现,所以需要在父类中查找,这时候就用到 method_getImplemetation 去获取 class_getInstanceMethod 里面的方法实现,然后再进行 class_replaceMethod 来实现 Swizzing
        if didAddMethod {
            class_replaceMethod(self, swizzledSelector, method_getImplementation(originalMethod!), method_getTypeEncoding(originalMethod!))
        } else {
            method_exchangeImplementations(originalMethod!, swizzledMethod!)
        }
    }

    @objc func switchUpdateNavigation() {
        switchUpdateNavigation()
        
        if let t = super.title {
            let arr = t.split(separator: " ")
            self.pbNumLb.text = String(arr[0])+"/"+String(arr[2])
        }
    }
}

例2：

// 替换AppIcon禁止弹框
extension UIViewController {
    public class func initializeMethod2(){
        
        let originalSelector = #selector(UIViewController.yj_present(viewControllerToPresent:animated:completion:))
        let swizzledSelector = #selector(UIViewController.present(_:animated:completion:))

        let originalMethod = class_getInstanceMethod(self, originalSelector)
        let swizzledMethod = class_getInstanceMethod(self, swizzledSelector)

        //在进行 Swizzling 的时候,需要用 class_addMethod 先进行判断一下原有类中是否有要替换方法的实现
        let didAddMethod: Bool = class_addMethod(self, originalSelector, method_getImplementation(swizzledMethod!), method_getTypeEncoding(swizzledMethod!))
        //如果 class_addMethod 返回 yes,说明当前类中没有要替换方法的实现,所以需要在父类中查找,这时候就用到 method_getImplemetation 去获取 class_getInstanceMethod 里面的方法实现,然后再进行 class_replaceMethod 来实现 Swizzing
        if didAddMethod {
            class_replaceMethod(self, swizzledSelector, method_getImplementation(originalMethod!), method_getTypeEncoding(originalMethod!))
        } else {
            method_exchangeImplementations(originalMethod!, swizzledMethod!)
        }
    }

    @objc func yj_present(viewControllerToPresent: UIViewController, animated: Bool, completion: (() -> Void)?) {
        if let alertC = viewControllerToPresent as? UIAlertController {
            if alertC.title == nil && alertC.message == nil {
                return
            }
        }
        self.yj_present(viewControllerToPresent: viewControllerToPresent, animated: animated, completion: completion)
    }
}

使用：
在AppDelegate.swift文件中的 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 方法中调用这个公开的类方法

// 替换原来的方法，以正确方式显示图片数量
PhotoBrowserController.initializeMethod()
UIViewController.initializeMethod2()