ios学习路线—Objective-C(深浅拷贝)

// 非容器类对象
    NSString *str = @\"origin string\";
    NSString *strCopy = [str copy];
    NSMutableString *mstrCopy = [str mutableCopy];
    [mstrCopy appendString:@\"??\"];

//    NSLog(@\"array1     = %p\", array1);
//    NSLog(@\"arrayCopy1 = %p\", arrayCopy1);

    NSMutableString *mstr = [NSMutableString stringWithString:@\"origin\"];
    NSString *strCopy = [mstr copy];
    NSMutableString *mstrCopy = [mstr copy];
    NSMutableString *mstrMCopy = [mstr mutableCopy];
    //[mstrCopy appendString:@\"1111\"];  //error
    [mstr appendString:@\"222\"];
    [mstrMCopy appendString:@\"333\"];

    /* copy返回不可变对象，mutablecopy返回可变对象 */
    NSArray *array1     = [NSArray arrayWith s:@\"a\",@\"b\",@\"c\",nil];
    NSArray *arrayCopy1 = [array1 copy];
    //arrayCopy1是和array同一个NSArray对象（指向相同的对象），包括array里面的元素也是指向相同的指针
    NSLog(@\"array1 retain count: %d\",[array1 retainCount]);   　　　// 2
    NSLog(@\"array1 retain count: %d\",[arrayCopy1 retainCount]);    //  2

    NSMutableArray *mArrayCopy1 = [array1 mutableCopy];
    //mArrayCopy1是array1的可变副本，指向的对象和array1不同，但是其中的元素和array1中的元素指向的还是同一个对象。mArrayCopy1还可以修改自己的对象
    [mArrayCopy1 add :@\"de\"];
    [mArrayCopy1 remove AtIndex:0];

    NSArray *mArray1 = [NSArray arrayWith s:[NSMutableString stringWithString:@\"a\"],@\"b\",@\"c\",nil];
    NSLog(@\"mArray1 retain count: %d\",[mArray1 retainCount]);
    NSArray *mArrayCopy2 = [mArray1 copy];
    NSLog(@\"mArray1 retain count: %d\",[mArray1 retainCount]);
    // mArray1和mArrayCopy2指向同一对象，retain值+1。

    NSMutableArray *mArrayMCopy1 = [mArray1 mutableCopy];
    NSLog(@\"mArray1 retain count: %d\",[mArray1 retainCount]);
    //mArrayCopy2和mArray1指向的是不一样的对象，但是其中的元素都是一样的对象——同一个指针

    NSMutableString *testString = [mArray1  AtIndex:0];
    //testString = @\"1a1\";//这样会改变testString的指针，其实是将@“1a1”临时对象赋给了testString
    [testString appendString:@\" tail\"];//这样以上三个数组的首元素都被改变了

NSArray *array = [NSArray arrayWith s:[NSMutableString stringWithString:@\"first\"] ,[NSString stringWithString:@\"b\"],@\"c\",nil];
NSArray *deepCopyArray=[[NSArray alloc] initWithArray: array copyItems: YES];
NSLog(@\"array[2] = %@, deepCopyArray[2]=%@ \",[array  AtIndex:2], [deepCopyArray  AtIndex:2]);  //输出值是一样的
NSLog(@\"array[2]         %p\", [array  AtIndex:2]);
NSLog(@\"deepCopyArray[2] %p\", [deepCopyArray  AtIndex:2]);   
  //最后两个打印的log内存地址值是一样的


NSArray* trueDeepCopyArray = [NSKeyedUnarchiver unarchive WithData:[NSKeyedArchiver archivedDataWithRoot : array]];

#import <foundation /Foundation.h>
@interface NSDictionary(MutableDeepCopy)
- (NSMutableDictionary *)mutableDeepCopy;
@end

#import \"NSDictionaryMutableDeepCopy.h\"
@implementation NSDictionary(MutableDeepCopy)
- (NSMutableDictionary *)mutableDeepCopy {
    NSMutableDictionary *ret = [[NSMutableDictionary alloc]
                                initWithCapacity:[self count]];
    NSArray *keys = [self allKeys];
    for (id key in keys) {
        id oneValue = [self valueForKey:key];
        id oneCopy = nil;
        if ([oneValue respondsToSelector:@selector(mutableDeepCopy)]) {
            oneCopy = [oneValue mutableDeepCopy];
        }
        else if ([oneValue respondsToSelector:@selector(mutableCopy)]) {
            oneCopy = [oneValue mutableCopy];
        }
        if (oneCopy == nil) {
            oneCopy = [oneValue copy];
        }
        [ret setValue:oneCopy forKey:key];
    }
    return ret;
}

@interface MyObj : NS <nscopying ,NSMutableCopying>
{
         NSMutableString *name;
         NSString *imutableStr;
         int age;
}
@property (nonatomic, retain) NSMutableString *name;
@property (nonatomic, retain) NSString *imutableStr;
@property (nonatomic) int age;

@end

@implementation MyObj
@synthesize name;
@synthesize age;
@synthesize imutableStr;
- (id)init
{
         if (self = [super init])
         {
                   self.name = [[NSMutableString alloc]init];
                   self.imutableStr = [[NSString alloc]init];
                   age = -1;
         }
         return self;
}

- (void)dealloc
{
         [name release];
         [imutableStr release];
         [super dealloc];
}
- (id)copyWithZone:(NSZone *)zone
{
         MyObj *copy = [[[self class] allocWithZone:zone] init];
         copy->name = [name copy];
         copy->imutableStr = [imutableStr copy];
//       copy->name = [name copyWithZone:zone];;
//       copy->imutableStr = [name copyWithZone:zone];//
         copy->age = age;
         return copy;
}
- (id)mutableCopyWithZone:(NSZone *)zone
{
    MyObj *copy = NSCopy (self, 0, zone);
    copy->name = [self.name mutableCopy];
    copy->age = age;
    return copy;
}
@end