背景

最近在做項目的時候用到了運行時，感覺他的代碼很分散，于是寫了一個工具RuntimeTool，把運行時常用的一些操作封裝成了API，歡迎大家使用，如果感覺不錯請記得start。

功能：

• 獲取類所有的變量列表
• 獲取類所有的屬性列表
• 獲取類所有的方法列表
• 通過NSInvocation調用方法
• 運行時動態創建類
• 運行時動態創建方法
• 關聯對象（關聯，獲取，刪除）
• 方法替換
• 設置私有變量

Installation

RuntimeTool支持多種安裝方法

installation with CocoaPods

RuntimeTool is available through CocoaPods. To install
it, simply add the following line to your Podfile:

pod "RuntimeTool",'~>1.0'

然后，運行下面的命令：

pod install

Usage

獲取所有變量列表

    [RuntimeTool getVarsForClassName:@"UIView"];
    [RuntimeTool getVarsForClass:[UIView class]];

獲取所有的屬性列表

    [RuntimeTool getPropertiesForClass:[UIView class]];
    [RuntimeTool getPropertiesForClassName:@"UIView"];

獲取所有的方法列表

    [RuntimeTool getMethodsForClass:[UIView class]];
    [RuntimeTool getMethodsForClassName:@"UIView"];

通過NSInvocation調用方法

    TestClass * test = [TestClass new];
    id returnValue = [RuntimeTool invokeMethod:test method:@selector(setNum:height:name:) argumentValue:@(10), nil];

運行時動態創建類

    Class class = [RuntimeTool createClassOnRuntime:@"MyButton" superClass:@"UIButton"];

運行時動態創建方法

    NSString* className = @"MyButton";
    NSString* methodStr = @"printLog";
    Class newClass = [RuntimeTool createClassOnRuntime:className superClass:@"UIButton"];
    [RuntimeTool createMethodForClass:className methodStr:methodStr imp:(IMP)printLog];
    id instance = [[newClass alloc]init];
    [instance performSelector:NSSelectorFromString(methodStr) withObject:nil];
    
    //方法的實現
    void printLog(id self,SEL _cmd) {
    printf("hello,world");
}

關聯對象

    //給當前controller關聯一個color對象
    NSString* key = @"colorKey";
    [RuntimeTool createAssociatedObject:self key:key value:[UIColor yellowColor] policy:OBJC_ASSOCIATION_RETAIN];
    //獲取color對象并設置背景色
    UIColor* color = (UIColor*)[RuntimeTool getAssociatedObjectValue:self key:key];
    self.view.backgroundColor = color;
    //刪除關聯對象
    [RuntimeTool removeAssociatedObjec:self];
    [self performSelector:@selector(clearColor) withObject:nil afterDelay:2];

方法替換

- (void)test1 {
    NSLog(@"test1");
}

- (void)test2 {
    NSLog(@"test2");
}

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    NSLog(@"hello,wrold");
}

- (void)swizzle_viewWillAppear:(BOOL)animated{
    NSLog(@"world,hello");
}


//方式1（兩個方法相互替換實現）：
[self test1];
[RuntimeTool methodExchange:[self class] sel1:@selector(test1) sel2:@selector(test2)];
[self test2];
//輸出結果都是  test1

//方式2（替換某個方法的實現）：
[self viewWillAppear:NO];
[RuntimeTool swizzleMethodImp:[self class] sel:@selector(viewWillAppear:) imp:method_getImplementation(class_getInstanceMethod([self class], @selector(swizzle_viewWillAppear:)))];
[self viewWillAppear:NO];

//輸出結果  hello,world    world,hello

設置私有變量

    TestClass * test = [TestClass new];
    test.num = @(100);
    NSLog(@"alter before: %@",test.num);
    [RuntimeTool setVarForObj:test key:@"_num" value:@(100000)];
    NSLog(@"alter after: %@",test.num);

Author

guodongyangw@163.com, guodongyang@qfpay.com

License

RuntimeTool is available under the MIT license. See the LICENSE file for more info.