iOS开发之 运行时封装

背景

最近在做项目的时候用到了运行时，感觉他的代码很分散，于是写了一个工具RuntimeTool，把运行时常用的一些操作封装成了API，欢迎大家使用，如果感觉不错请记得start。

功能：

• 获取类所有的变量列表
• 获取类所有的属性列表
• 获取类所有的方法列表
• 通过NSInvocation调用方法
• 运行时动态创建类
• 运行时动态创建方法
• 关联对象（关联，获取，删除）
• 方法替换
• 设置私有变量

Installation

RuntimeTool支持多种安装方法

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，运行下面的命令：

pod install

Usage

获取所有变量列表

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

获取所有的属性列表

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

获取所有的方法列表

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

通过NSInvocation调用方法

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

运行时动态创建类

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

运行时动态创建方法

    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];
    
    //方法的实现
    void printLog(id self,SEL _cmd) {
    printf("hello,world");
}

关联对象

    //给当前controller关联一个color对象
    NSString* key = @"colorKey";
    [RuntimeTool createAssociatedObject:self key:key value:[UIColor yellowColor] policy:OBJC_ASSOCIATION_RETAIN];
    //获取color对象并设置背景色
    UIColor* color = (UIColor*)[RuntimeTool getAssociatedObjectValue:self key:key];
    self.view.backgroundColor = color;
    //删除关联对象
    [RuntimeTool removeAssociatedObjec:self];
    [self performSelector:@selector(clearColor) withObject:nil afterDelay:2];

方法替换

- (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（两个方法相互替换实现）：
[self test1];
[RuntimeTool methodExchange:[self class] sel1:@selector(test1) sel2:@selector(test2)];
[self test2];
//输出结果都是  test1

//方式2（替换某个方法的实现）：
[self viewWillAppear:NO];
[RuntimeTool swizzleMethodImp:[self class] sel:@selector(viewWillAppear:) imp:method_getImplementation(class_getInstanceMethod([self class], @selector(swizzle_viewWillAppear:)))];
[self viewWillAppear:NO];

//输出结果  hello,world    world,hello

设置私有变量

    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.