- 指针地址，数据地址， 数据
非容器不可变对象
- 浅拷贝不开辟新内存，数据不可变
- 深拷贝开辟新内存，数据可变
NSString *str1 = @"非容器不可变对象";
NSMutableString *str2 = [str1 copy];
NSMutableString *str3 = [str1 mutableCopy];
// [str2 appendString:@" 更改"]; //崩溃
[str3 appendString:@" 更改"];
NSLog(@"str1: %@, str1_p : %p, class: %@",str1, str1, [str1 class]);
NSLog(@"str2: %@, str2_p : %p, class: %@",str2, str2, [str2 class]);
NSLog(@"str3: %@, str3_p : %p, class: %@",str3, str3, [str3 class]);
str1: 非容器不可变对象, str1_p : 0x10c687020, class: __NSCFConstantString
str2: 非容器不可变对象, str2_p : 0x10c687020, class: __NSCFConstantString
str3: 非容器不可变对象 更改, str3_p : 0x6000005dcc60, class: __NSCFString
非容器可变对象
- 浅拷贝开辟新内存，数据不可变
- 深拷贝开辟新内存，数据可变
NSMutableString *str1 = [NSMutableString stringWithFormat:@"非容器可变对象"];
NSMutableString *str2 = [str1 copy];
NSMutableString *str3 = [str1 mutableCopy];
// [str2 appendString:@"更改"]; 崩溃
[str3 appendString:@"更改"];
NSLog(@"str1: %@, str1_p : %p, class: %@",str1, str1, [str1 class]);
NSLog(@"str2: %@, str2_p : %p, class: %@",str2, str2, [str2 class]);
NSLog(@"str3: %@, str3_p : %p, class: %@",str3, str3, [str3 class]);
str1: 非容器可变对象, str1_p : 0x6000007b9fe0, class: __NSCFString
str2: 非容器可变对象, str2_p : 0x6000007b9d40, class: __NSCFString
str3: 非容器可变对象更改, str3_p : 0x6000007b9d70, class: __NSCFString
#容器非可变对象
- 浅拷贝不开辟新内存，数据不可变，容器类数据只拷贝指针
- 深拷贝开辟新内存，数据可变，容器类数据只拷贝指针
NSArray *array = [NSArray arrayWithObjects:str1, @"6789", nil];
NSMutableArray *copyArray = [array copy];
NSMutableArray *mutableCopyArray = [array mutableCopy];
[str1 appendString:@"-abc"];
//[copyArray addObject:@"efg"]; 崩溃
[mutableCopyArray addObject:@"efg"];
NSLog(@"array_p: %p, class: %@", array, [array class]);
NSLog(@"copyArray_p: %p, class: %@", copyArray, [copyArray class]);
NSLog(@"mutableCopyArray_p: %p, class: %@", mutableCopyArray, [mutableCopyArray class]);
NSLog(@"======原对象=====");
NSLog(@"arr[0]:%@ object_p: %p, class: %@", array[0], array[0], [array[0] class]);
NSLog(@"arr[1]:%@ object_p: %p, class: %@", array[1], array[1], [array[1] class]);
NSLog(@"======copy对象=====");
NSLog(@"arr[0]:%@ object_p: %p, class: %@", copyArray[0], copyArray[0], [copyArray[0] class]);
NSLog(@"arr[1]:%@ object_p: %p, class: %@", copyArray[1], copyArray[1], [copyArray[1] class]);
NSLog(@"======mutableCopy对象=====");
NSLog(@"arr[0]:%@ object_p: %p, class: %@", mutableCopyArray[0], mutableCopyArray[0], [mutableCopyArray[0] class]);
NSLog(@"arr[1]:%@ object_p: %p, class: %@", mutableCopyArray[1], mutableCopyArray[1], [mutableCopyArray[1] class]);
NSLog(@"mutableCopyArray: %@", mutableCopyArray);
array_p: 0x600002460740, class: __NSArrayI
copyArray_p: 0x600002460740, class: __NSArrayI
mutableCopyArray_p: 0x600002a124c0, class: __NSArrayM
======原对象=====
arr[0]:12345-abc object_p: 0x600002a12550, class: __NSCFString
arr[1]:6789 object_p: 0x10d9c8038, class: __NSCFConstantString
======copy对象=====
arr[0]:12345-abc object_p: 0x600002a12550, class: __NSCFString
arr[1]:6789 object_p: 0x10d9c8038, class: __NSCFConstantString
======mutableCopy对象=====
arr[0]:12345-abc object_p: 0x600002a12550, class: __NSCFString
arr[1]:6789 object_p: 0x10d9c8038, class: __NSCFConstantString mutableCopyArray: (
"12345-abc",
6789,
efg
)
容器可变对象
- 浅拷贝开辟新内存，数据不可变，容器类数据只拷贝指针
- 深拷贝开辟新内存，数据可变，容器类数据只拷贝指针
NSMutableString *str1 = [NSMutableString stringWithFormat:@"12345"];
NSMutableArray *array = [NSMutableArray arrayWithObjects:str1, @"6789", nil];
NSMutableArray *copyArray = [array copy];
NSMutableArray *mutableCopyArray = [array mutableCopy];
[str1 appendString:@"-abc"];
//[copyArray addObject:@"efg"];
[mutableCopyArray addObject:@"efg"];
NSLog(@"array_p: %p, class: %@", array, [array class]);
NSLog(@"copyArray_p: %p, class: %@", copyArray, [copyArray class]);
NSLog(@"mutableCopyArray_p: %p, class: %@", mutableCopyArray, [mutableCopyArray class]);
NSLog(@"======原对象=====");
NSLog(@"arr[0]:%@ object_p: %p, class: %@", array[0], array[0], [array[0] class]);
NSLog(@"arr[1]:%@ object_p: %p, class: %@", array[1], array[1], [array[1] class]);
NSLog(@"======copy对象=====");
NSLog(@"arr[0]:%@ object_p: %p, class: %@", copyArray[0], copyArray[0], [copyArray[0] class]);
NSLog(@"arr[1]:%@ object_p: %p, class: %@", copyArray[1], copyArray[1], [copyArray[1] class]);
NSLog(@"======mutableCopy对象=====");
NSLog(@"arr[0]:%@ object_p: %p, class: %@", mutableCopyArray[0], mutableCopyArray[0], [mutableCopyArray[0] class]);
NSLog(@"arr[1]:%@ object_p: %p, class: %@", mutableCopyArray[1], mutableCopyArray[1], [mutableCopyArray[1] class]);
NSLog(@"mutableCopyArray: %@", mutableCopyArray);
array_p: 0x600003f0b7b0, class: __NSArrayM
copyArray_p: 0x60000311dd60, class: __NSArrayI
mutableCopyArray_p: 0x600003f0b450, class: __NSArrayM
======原对象=====
arr[0]:12345-abc object_p: 0x600003f0b5d0, class: __NSCFString
arr[1]:6789 object_p: 0x107aa6038, class: __NSCFConstantString
======copy对象=====
arr[0]:12345-abc object_p: 0x600003f0b5d0, class: __NSCFString
arr[1]:6789 object_p: 0x107aa6038, class: __NSCFConstantString
======mutableCopy对象=====
arr[0]:12345-abc object_p: 0x600003f0b5d0, class: __NSCFString
arr[1]:6789 object_p: 0x107aa6038, class: __NSCFConstantString
mutableCopyArray: (
"12345-abc",
6789,
efg
)
完全深拷贝
使用归档解档的方法
NSMutableString *str1 = [NSMutableString stringWithFormat:@"非容器可变对象"];
NSArray *array = [NSArray arrayWithObjects:str1, @"非容器不可变对象", nil];
NSMutableArray *mutableArray = [[NSMutableArray alloc] initWithArray:array copyItems:YES];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:mutableArray requiringSecureCoding:YES error:nil];
NSMutableArray *newMutableArray = [NSKeyedUnarchiver unarchivedObjectOfClass:[NSMutableArray class] fromData:data error:nil];
NSLog(@"===原对象===");
NSLog(@"array[0] : %p, array[1] : %p", array[0], array[1]);
NSLog(@"===新对象===");
NSLog(@"mutableArray[0] : %p, mutableArray[1] : %p", mutableArray[0], mutableArray[1]);
NSLog(@"===完全拷贝对象===");
NSLog(@"newMutableArray[0] : %p, newMutableArray[1] : %p", newMutableArray[0], newMutableArray[1]);
如果是自定义类对象 需要遵循
@interface TestModel : NSObject<NSSecureCoding>
@property (nonatomic, strong) NSString *name;
@end
@implementation TestModel
+ (BOOL)supportsSecureCoding{
return YES;
}
- (void)encodeWithCoder:(nonnull NSCoder *)coder {
[coder encodeObject:self.name forKey:@"name"];
}
- (nullable instancetype)initWithCoder:(nonnull NSCoder *)coder {
self.name = [coder decodeObjectForKey:@"name"];
return self;
}
@end
TestModel *model = [[TestModel alloc] init];
model.name = @"tianya";
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:model requiringSecureCoding:YES error:nil];
TestModel *model1 = [NSKeyedUnarchiver unarchivedObjectOfClass:[TestModel class] fromData:data error:nil];
NSLog(@"model = %@, model1 = %@",model, model1);
自定义对象拷贝
自定义对象， 需要我们去遵循 、 其实现方法我们可以根据自己的需要去填写
@interface TestModel : NSObject <NSMutableCopying, NSCopying>
@property (nonatomic, copy) NSString *name;
@end
@implementation TestModel
-(id)mutableCopyWithZone:(NSZone *)zone{
TestModel *model = [[[self class] allocWithZone:zone] init];
model->_name = [_name mutableCopy];
return model;
}
- (nonnull id)copyWithZone:(nullable NSZone *)zone {
return self;
}
@end
