iOS-runtimeの一般的な方法の例

で使用されるカスタムクラス:

#import 

@interface Person : NSObject

@property(nonatomic,copy) NSString *name;
@property(nonatomic,copy) NSString *sex;
-(NSString *)sayName;
-(NSString *)saySex;

@end

動的変数制御

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.person = [Person new];
    _person.name = @"xiaoming";
    NSLog(@"XiaoMing first answer is %@",self.person.name);
    
    [self sayName];
}

- (void)sayName
{
    unsigned int count = 0;
    Ivar *ivar = class_copyIvarList([self.person class], &count);
    for (int i = 0; i) {
        Ivar var = ivar[i];
        const char *varName = ivar_getName(var);
        NSString *proname = [NSString stringWithUTF8String:varName];
        
        if ([proname isEqualToString:@"_name"]) {   //            
            object_setIvar(self.person, var, @"daming");
            break;
        }
    }
    NSLog(@"XiaoMing change name  is %@",self.person.name);
}

動的追加方法

- (void)viewDidLoad {
    [super viewDidLoad];
    self.person = [Person new];
    [self sayFrom];
}

- (void)sayFrom
{
    class_addMethod([self.person class], @selector(guess), (IMP)guessAnswer, "v@:");
    if ([self.person respondsToSelector:@selector(guess)]) {
        //Method method = class_getInstanceMethod([self.xiaoMing class], @selector(guess));
        [self.person performSelector:@selector(guess)];
        
    } else{
        NSLog(@"Sorry,I don't know");
    }
}

void guessAnswer(id self,SEL _cmd){
    NSLog(@"function: guessAnswer");
    NSLog(@"__%@__", NSStringFromSelector(_cmd));
}

- (void) guess{
    NSLog(@"function: guess");
    NSLog(@"__%@__", NSStringFromSelector(_cmd));
}

動的交換の2つの方法の実装

- (void)viewDidLoad {
    [super viewDidLoad];
    self.person = [Person new];
    
    NSLog(@"%@",_person.sayName);
    NSLog(@"%@",_person.saySex);
    
    Method m1 = class_getInstanceMethod([self.person class], @selector(sayName));
    Method m2 = class_getInstanceMethod([self.person class], @selector(saySex));
  
    method_exchangeImplementations(m1, m2);
}

ブロック置換方法

@interface Tool : NSObject

+ (instancetype)sharedManager;
- (NSString *)changeMethod;
- (void)addCount;

@end

#import "Tool.h"

@interface Tool ()

@property (nonatomic, assign) NSInteger count;

@end

@implementation Tool

+ (instancetype)sharedManager {
    static Tool *_sInstance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sInstance = [[Tool alloc] init];
    });
    
    return _sInstance;
}

- (NSString *)changeMethod
{
    return @"haha,          ";
}

- (void)addCount
{
    _count += 1;
    
    NSLog(@"    ------%ld", _count);
}

@end

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //        [self.person class],       
    Method m1 = class_getInstanceMethod([Person class], @selector(sayName));
    Method m2 = class_getInstanceMethod([Tool class], @selector(changeMethod));
    
    method_exchangeImplementations(m1, m2);
}

メソッドに追加機能

を追加

@implementation FiveViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(100, 100, 100, 100);
    [button setTitle:@"  " forState:UIControlStateNormal];
    [button addTarget:self action:@selector(ButtonClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

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

@end

runtimeをまとめ、コードは以下の通り:

1、ランタイムヘッダファイルをロードする:

#import 

2、具体的な実装コード:

/**     ：MyObject */
//   
#import 

@interface MyObject : NSObject
@property(strong,nonatomic) NSString *string;
@property(strong,nonatomic) NSArray  *array;

- (void)method1;
- (void)method2;
- (void)classMethod1;
@end

//   
#import "MyObject.h"
#import 
@interface MyObject (){
    NSInteger _instance1;
    NSString  *_instance2;
}

@property(assign,nonatomic) NSInteger intrger;
- (void)method3WithArge1:(NSInteger)arge1 arge2:(NSString *)arge2;
@end

@implementation MyObject

-(void)classMethod1{
}

- (void)method1{
    NSLog(@"cell Method1");
}

- (void)method2{
}

- (void)method3WithArge1:(NSInteger)arge1 arge2:(NSString *)arge2{
    NSLog(@"arge1 %ld arge2 %@",arge1,arge2);
}

+ (BOOL)resolveInstanceMethod:(SEL)sel{
    NSString *selector = NSStringFromSelector(sel);
    if ([selector isEqualToString:@"method1"]) {
        class_addMethod(self.class, @selector(method1), (IMP)functionForMethod1, "@:");
    }
    return [super resolveInstanceMethod:sel];
}

void functionForMethod1(id self,SEL _cmd){
    NSLog(@"%@ %p",self,_cmd);
}

- (instancetype)forwardingTargetForSelector:(SEL)aSelector{
    NSString *selector = NSStringFromSelector(aSelector);
    if([selector isEqualToString:@"method2"]){
　　//return;
    }
    return [super forwardingTargetForSelector:aSelector];
}

- (void)forwardInvocation:(NSInvocation *)anInvocation{
}

@end

/**      */
#import 

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
　　//1.     
　　//     ViewController
    NSLog(@"%s",class_getName([self class]));
　　//    
　　//This is superClass 0x10f426da0  isa    
    NSLog(@"This is superClass %p",class_getSuperclass([self class]));

　　//     
　　//Is MateClass 0
    NSLog(@"Is MateClass %d",class_isMetaClass([self class]));
　　//      
　　//848
    size_t a =  class_getInstanceSize([self class]);
    NSLog(@"%ld",a);
    unsigned int outCount = 0;
    MyObject *objtect = [[MyObject alloc] init];
    Class cls = objtect.class;
    
    //  
    NSLog(@"Class name %s",class_getName(cls));
    //    
    NSLog(@"SuperClass name  %s",class_getName(class_getSuperclass(cls)));
    //    
    NSLog(@"Is MetaClass %@",(class_isMetaClass(cls))?@"":@"NOT");
    //    
    NSLog(@"MyObject size %ld",class_getInstanceSize(cls));
    //    
    Ivar string = class_getInstanceVariable(cls, "_string");
 
    if (string != NULL) {
         NSLog(@"MyObject instance messge %s",ivar_getName(string));
    }
    //     
    objc_property_t *v = class_copyPropertyList(cls, &outCount);
    for (NSInteger i = 0; i< outCount; i++) {
        objc_property_t property = v[i];
        NSLog(@"property is %s ",property_getName(property));
    }
    free(v);
   
    //    
    Ivar *vars = class_copyIvarList(cls, &outCount);
    for (NSInteger i =0; i< outCount; i++) {
        Ivar ivar = vars[i];
        NSLog(@"copyIvarList is %s is %ld",ivar_getName(ivar),i);
    }
     free(vars);
    //    
    Method *methods = class_copyMethodList(cls, &outCount);
    for (NSInteger i =0; i< outCount; i++) {
        Method met = methods[i];
    #pragma clang diagnostic ignored"-Wformat"
        NSLog(@"Method is %s",method_getName(met));
    }
    free(methods);

    //  Format specifies type 'char *' but the argument has type 'SEL _Nonnull'
    //      
    Method method = class_getInstanceMethod(cls,@selector(method1));
    NSLog(@"Method name is %s",method_getName(method));
    //         
     #pragma clang diagnostic ignored"-Wundeclared-selector"
    NSLog(@"Have you method %d",class_respondsToSelector(cls, @selector(method3WithArge1:arge2:)));
    //          ，        
    IMP imp = class_getMethodImplementation(cls, @selector(method1));
    imp();
    //     
     #pragma clang diagnostic ignored" -Wunused-variable"
    //  :     ,   objc_allocateClassPair objc_registerClassPair            
    //  1.             MySubClass
    //    class,  ,    
    Class myClass = objc_allocateClassPair(objtect.class, "MySubClass", 0);
    //  2.    ，    
    // :  v@:     v void   @:      
    if( class_addMethod(myClass, @selector(mysubMethod1),(IMP)mysubMethod1, "v@:")){
        class_replaceMethod(myClass, @selector(method1),  (IMP)mysubMethod1,"v@:");
    }

    /*
     3.    NSSsting         myString
      size sizeof(NSString)
                 log2(sizeof(NSString*))
           @encode(NSString*)
    class_addIvar(class,   ,  size,  ,  )
    */
    //         
    BOOL isd =  class_addIvar(myClass, "_myString", sizeof(NSString *),  log(sizeof(NSString *)), @encode(NSString *));
    NSLog(@"         %d",isd);
    /*
          
               T@encode(type)   ,   V         ,         ,  property_getAttributes    
             
    R readonly
    C copy
    & retain ARC strong
    N nonatomic
    G(name) getter=(name)
    S(name) setter=(name)
    D @dynamic
    W weak
    P         
    */
    //@T
    objc_property_attribute_t type;
    type.name = "T";
    type.value = @encode(NSString *);
    //copy
    objc_property_attribute_t owership = {"C",""};
    //nonatomic
    objc_property_attribute_t oeership2 = {"N",""};
    //V_   
    objc_property_attribute_t var = {"V","_myString"};
    //    
    objc_property_attribute_t attributes[] = {type,owership,oeership2,var};
    //       myString   ,        attributes 
    class_addProperty(myClass, "myString", attributes, 4);
    unsigned int propertyCount;
    objc_property_t * properties = class_copyPropertyList(myClass, &propertyCount);
    for (int i = 0; i) {
        NSLog(@"       : %s",property_getName(properties[i]));
        NSLog(@"         : %s",property_getAttributes(properties[i]));
    }
    //        
    free(properties);
    
    //       objc_allocateClassPair    
    objc_registerClassPair(myClass);
    
    id instance = [[myClass alloc] init];
    [instance performSelector:@selector(mysubMethod1)];
    [instance performSelector:@selector(method1)];
    
    //            
    //         ，                  ，             
    //objc_disposeClassPair(myClass);
    
    //    
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
    view.backgroundColor = [UIColor redColor];
    [view setTapActionWithBlock:^{
        NSLog(@"saAS");
    }];
    [self.view addSubview:view];
　　//SEL
　　//Objective-C    ，           、    ，           (Int     )，      SEL
　　//SEL           （    ，         hash   KEY ，         
　　//                        ，          
　　//sel : 0x104dd7735
    /*
           SEL:
    
    sel_registerName  
    Objective-C      @selector()
    NSSelectorFromString()  
    */

    SEL sel1 = @selector(method1);
    NSLog(@"sel : %p", sel1);
}

static void mysubMethod1(id self,SEL _cmd){
    NSLog(@"       ");
}

@end

 
転載先:https://www.cnblogs.com/xujinzhong/p/8549132.html