使用方法：
- (void)testIMP
{
//1. 实例方法无参数
TestClass *adapt = [[TestClassalloc] init];
SEL sel =@selector(test);
IMP imp = [adaptmethodForSelector:sel];
void (*func)(__strongid,SEL) = (void (*)(__strongid, SEL))imp;
func( adapt, sel);
//2. 实例方法有参数
NSString *param =@"AAA";
sel = @selector(test2:);
imp = [adapt methodForSelector:sel];
void (*func2)(__strongid,SEL,NSString*) = (void (*)(__strongid, SEL,NSString*))imp;
func2( adapt, sel, param);
//3. 实例方法有参数
imp = [TestClassinstanceMethodForSelector:sel];
void (*func3)(__strongid,SEL,NSString*) = (void (*)(__strongid, SEL,NSString*))imp;
func3(adapt, sel, param);
//4. 类方法
sel = @selector(test3);
imp = [TestClassmethodForSelector:sel];
void (*func4)(__strongid,SEL) = (void (*)(__strongid, SEL))imp;
func4(nil, sel);
}
- (void)test
{
NSLog(@"---test");
}
- (void)test2:(NSString*)str
{
NSLog(@"---test2:%@", str);
}
+ (void)test3
{
NSLog(@"---test3");
}
区别：
methodForSelector：
If the receiver is an instance, aSelector should refer to an instance method;
if the receiver is a class, it should refer to a class method.
instanceMethodForSelector：
Use this method to ask the class object for the implementation of instance methods only.
To ask the class for the implementation of a class method, send the methodForSelector: instance method to the class instead.
