assign ringtone

another nsstring, the address is 0x2222, the content is the same, the new object retain is 1, the old object has not changedRetain to another nsstring, the same address (set up a pointer, pointer copy), the content of course the same, the object's retain value +1That is, retain is a pointer copy and copy is a copy of the content. Wow, it's a lot easier than you think.The set method of retain should be shallow copy, copy's set method should be deep copyCopy another usage:Copy is a copy of the co

access to the property, the return value obtained from the picker, or the value set by the setting can be done at once, even if another thread is accessing it. If you do not specify nonatomic, the parsed accessor retains and automatically releases the returned value in the environment in which it manages the memory, and if nonatomic is specified, the accessor simply returns the value.AssignFor the underlying data type (nsinteger,cgfloat) and the C data type (int, float, double, char), and so on

of these problems are serious, so be sure to pay attention to memory release and set to nil after usemember variables and propertiesIt's not as simple as it is, you might need to call another function to assign a variable in one function.There are two options:class member variables and usage properties@interface Testmem:nsobject {Testobject *m_testobject; //Member variablesTestobject *testobject; //Member variables}The member variables are consistent

time passes?Why did such a thing happen? Let's take a look at the code inside the edit controller. Publicfunction edit () {if(Request (),IsPost ()) {//If the form is submitted $data= Input ("Post.");//Get data to the editing interface $validate= Loader::validate ("Link");//Load Validator classif(! $validateCheck ($data)) {//Verify data is consistent with our defined validation rules$ ThisError ($validate->geterror (),"Edit","","2"); Die } $linkModel =NewLinkmodel ();$updat

Copy: Create an object with an index count of 1 and release the nsstringIt indicates to nsstring that a copy of the input value is used when the value is assigned. The copy operation is executed by the copy method. This attribute is only valid for object types that implement the nscopying protocol. For more information, see "copy. Retain: Release the old object, assign the value of the old object to the input object, and increase the index count of th

Copy: Create an object with an index count of 1 and release the nsstringIt indicates to nsstring that a copy of the input value is used when the value is assigned. The copy operation is executed by the copy method. This attribute is only valid for object types that implement the nscopying protocol. For more information, see "copy. Retain: Release the old object, assign the value of the old object to the input object, and increase the index count of th

another nsstring, the address is 0x2222, the content is the same, the new object retain is 1, the old object has not changedRetain to another nsstring, the same address (set up a pointer, pointer copy), the content of course the same, the object's retain value +1That is, retain is a pointer copy and copy is a copy of the content. Wow, it's a lot easier than you think.The set method of retain should be shallow copy, copy's set method should be deep copyCopy another usage:Copy is a copy of the co

Assign: Simple assignment, not changing index countCopy: Create an object with an index count of 1 and then release the old objectRetain: Frees the old object, assigns the value of the old object to the input object, and then increases the index count of the input object to 1Copy actually creates an identical object, and retain is not:such as a NSString object, the address is 0x1111, the content is @ "STR"Copy to another nsstring, the address is 0x222

Assign: Simple assignment, not changing index countCopy: Create an object with an index count of 1 and then release the old objectRetain: Frees the old object, assigns the value of the old object to the input object, and then increases the index count of the input object to 1Copy actually creates an identical object, and retain is not:such as a NSString object, the address is 0x1111, the content is @ "STR"Copy to another nsstring, the address is 0x222

Assign: simple assignment without changing the index countCopy: Create an object with an index count of 1 and release the old object.Retain: Release the old object, assign the value of the old object to the input object, and increase the index count of the input object to 1. Copy actually creates the same object, and retain is not:For example, an NSString object with the address 0 × 1111 and the content @ "

Use assign: for underlying data types (nsinteger,cgfloat) and C data types (int, float, double, char, and so on)Using copy: On NSStringUse retain: For other nsobject and its subclassesAssign: Simple assignment, not changing index countCopy: Create an object with an index count of 1 and then release the old objectRetain: Frees the old object, assigns the value of the old object to the input object, and then increases the index count of the input object