在objective-c中创建自定义动态类

id<UIAlertViewDelegate> myCustomcatlass = @class {
    my class code goes here
}

UIAlertView* alertView;
alertView = [[UIAlertView alloc] initWithtitle:@"title"
                                       message:@"message"
                                      delegate:myCustomcatlass
                             cancelButtontitle:@"No"
                             otherButtontitles:@"OK",@"Sure",@"Maybe",nil] ];    
[alertView show];

不 – Objective-C中没有“内联类”.话虽如此,您可以使用objective-c在运行时创建自定义对象,这有点涉及,但我愿意分享一些代码来做你所说的.

这是一个例子：

NSObject Subclass.h

#import <objc/runtime.h>

typedef struct selBlockPair { SEL aSEL; id (^__unsafe_unretained aBlock)(id,...); } selBlockPair;
#define NIL_PAIR ((struct selBlockPair) { 0,0 })
#define PAIR_LIST (struct selBlockPair [])
#define BLOCK_CAST (id (^)(id,...))

@interface NSObject (subclass)

+(Class) newSubclassNamed:(NSString *) name
            protocols:(Protocol **) protos
                 impls:(selBlockPair *) impls;

@end

NSObject Subclass.m

@implementation NSObject (subclass)

+(Class) newSubclassNamed:(NSString *)name
             protocols:(Protocol **)protos
                 impls:(selBlockPair *)impls
{
    if (name == nil)
    {
        // basically create a random name
        name = [NSString StringWithFormat:@"%s_%i_%i",class_getName(self),arc4random(),arc4random()];
    }

    // allocated a new class as a subclass of self (so I Could use this on a NSArray if I wanted)
    Class newClass = objc_allocateClassPair(self,[name UTF8String],0);

    // add all of the protocols untill we hit null
    while (protos && *protos != NULL)
    {
        class_addProtocol(newClass,*protos);
        protos++;
    }

    // add all the impls till we hit null
    while (impls && impls->aSEL)
    {
        class_addMethod(newClass,impls->aSEL,imp_implementationWithBlock(impls->aBlock),"@@:*");
        impls++;
    }

    // register our class pair
    objc_registerClassPair(newClass);

    return newClass;
}

@end

用法示例：

int main()
{
    @autoreleasepool {
        __strong Class newClass = [NSString newSubclassNamed:@"MyCustomString" protocols:NULL impls: PAIR_LIST {
            @SELEctor(description),BLOCK_CAST ^id (id self) {
                return @"tesTing";
            },NIL_PAIR
        }];

        NSString *someString = [newClass new];
        NSLog(@"%@",someString);
    }
}

输出：

2012-10-01 10:07:33.609 TestProj[54428:303] tesTing