array);NSLog(@"shalldowCopyArray address: %p",shalldowCopyArray);NSLog(@"deepCopyArray address: %p",deepCopyArray);NSLog(@"array[0] address: %p",array[0]);NSLog(@"shalldow
NSLog(@"array1: %p, \n%@", array1, array1); NSLog(@"array2: %p, \n%@", array2, array2); NSLog(@"mutableArray2: %p, \n%@", mutableArray2, mutableArray2); //mutableArray3是mutableArray2调用mutableCopy的结果 NSMutableArray* mutableArray3 = [mutableArray2 mutableCopy]; NSLog(@...
NSArray *array1 = [NSArray arrayWithObjects:@"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]); NSLog(@"array1 retain count...
NSArray *array = [NSArray arrayWithObjects:[NSMutableString stringWithString:@"first"],[NSStringstringWithString:@"b"],@"c",nil]; NSArray *deepCopyArray=[[NSArray alloc] initWithArray: array copyItems: YES]; NSArray* trueDeepCopyArray = [NSKeyedUnarchiver unarchiveObjectWithData: [NSKeyedArch...
说道拷贝大家可能联想到深拷贝和浅拷贝概念,然而在swift却很少涉及宝贝问题,即使swift下依然有copy和mutableCopy方法。但终其原因,创建单纯的swift类并不需要继承NSObject,而是使用swift类,另外很多牵扯拷贝问题的数组和字典,在swift对应于Array和Dictionary,不同于NSArray 和NSDictionary,swift的Array和Dictionary是值类型,...
[arrayDeepCopy addObject:[str copy]];} [str1 appendString:@"1234"];NSLog(@"array: %@", ...
NSMutableArray*array=[[NSMutableArray alloc]init];Person*person=[[Person alloc]init];person.name=[NSString stringWithFormat:@"张三"];person.age=18;[array addObject:person];// 不完全深拷贝NSArray*arrCopy=[array copy];NSMutableArray*arrMCopy=[array mutableCopy];Person*person1=[array firstObject...
创建副本可以使用以下方法:arr.copy():创建一个新的数组,该数组包含与原始数组相同元素的副本。...np.array(arr):将数组转换为新的 NumPy数组。arr[:]:使用切片创建整个数组的副本。...这意味着对视图进行的任何更改都会直接反映在原始数组中,反之亦然。创建视图可以使用以下方法:arr.view():创建一个新的数组...
mxDuplicateArraymakes a deep copy of an array, and returns a pointer to the copy. A deep copy refers to a copy in which all levels of data are copied. For example, a deep copy of a cell array copies each cell and the contents of each cell (if any). ...
//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 [mArrayCopy1addObject:@"de"]; [mArrayCopy1removeObjectAtIndex:0]; array1和arrayCopy1是指针复制,而mArrayCopy1是对象复制,符合前面示例1讨论的结论。mArray...