Block circular reference problem in iOS

1, block is a property of the Controller object, the use of self inside the block will cause the loop application

void (^testblock) (); @interface Secondviewcontroller () @property (nonatomic, copy) Testblock Testblock; @end  = ^()  {      NSLog (@ "%@", Self.mapview);  };  Self.testblock ();

2, the block inside out as a self method, when using Weakself call this method, and this method has the property of self, block does not cause memory leaks

Self.testblock = ^() {       [weakself test];}; -(void) test{    NSLog (@ "%@", Self.mapview);}

3. When the block is not a property of self, the use of self within the block does not cause a memory leak

Testblock Testblock = ^() {      NSLog (@ "%@", Self.mapview);}; [Self test:testblock];

4, when using the block as a parameter to use, the block internal use of self also does not cause memory leaks

- (void) viewdidload {[Super viewdidload]; [Self getData:^ (NSString *str) {NSLog (@"%@----%@", self, str);       }]; [ Selfclass] getdata:^ (NSString *str) {NSLog (@"class method--%@---%@", self, str); }];}- (void) GetData: (successblock) success{if(Success) {Success (@"Success"); }}+ (void) GetData: (successblock) success{if(Success) {Success (@"Success"); }}

Block circular reference problem in iOS