property with retain must of object type

Source: NetworkAssign: normal (simple) assignment, commonly used for basic data types, common delegate design patterns, once to prevent circular references. Do not change the index count (Reference counting). For underlying data types

AFNetworking 2.0 when Deployment Target is lower than 6.0, AFURLConnectionOperation. h, AFURLSessionManager. h @ Property (nonatomic, strong) dispatch_queue_t completionQueue; The error message is displayed because dispatch_queue_t ARC is not

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

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

1, memory management Simple Introduction1, why should I have memory management? malloc selloc dealloc ' need to go back to reviewThe general memory 4s is 512m memory; 6 is 1024m memory;When memory is too large, memory is exhausted. There is a

Transferred from: http://www.cnblogs.com/nonato/archive/2013/11/28/3447162.htmliOS objects are inherited from NSObject, which has a method: Retaincount, memory reference count.Reference counting is used in many techniques: COM components under

In the 1:ARC environment, strong instead of retain.weak instead of Assign,xcode 4.2 (iOS sdk4.3 and the following versions) and previous versions use Retain and assign, which do not support arc. Xcode 4.3 (iOS5 and above) has an arc and starts

Strong weakStrong and weak are the new object variable properties introduced by Arc, which introduces new life-cycle qualifiers for new objects, or 0 weak references. If the object that the 0 weak reference points to is deallocated, the 0 weakly

  (Example A)FooController.h:@interface FooController : UIViewController {    UILabel *fooLabel;}@property (nonatomic, retain) IBOutlet UILabel *fooLabel;@endFooController.m:@implementation FooController@synthesize fooLabel;@end But this works also

As a friend of C + + has learned, when we define Struct/class, if we set the Access qualifier (public,protected,private) to public, then we can access the data members directly from the. Like what In Test.h class Test {public : int i;