About Memory

APP_START

1. NSString *mm = [[NSString stringWithFormat:@"Minaki"] retain];
2. NSString *gg = [mm copy];
3. printf("mm----> %s gg---->%s \n", [mm UTF8String], [gg UTF8String]);
4. [mm release];
5. mm = [[NSString stringWithFormat:@"Lexi"] retain];
6. printf("mm----> %s gg---->%s \n", [mm UTF8String], [gg UTF8String]);
7. [mm release];
8. [gg release];
10. [self.window makeKeyAndVisible];
13. //对一个对象中的某一个属性retain之后，释放该对象，不会造成内存泄露，如下：
14. NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
15. Model *model = [[Model alloc] init];
16. printf("str:%d \n", [model.str retainCount]);
17. printf("str:%d \n", [model.str retainCount]);
18. model.str = [NSString stringWithFormat:@"String"];
19. printf("str:%d \n", [model.str retainCount]);
20. model.arr = [NSArray arrayWithObjects:@"Array", nil];
21. NSString *str2 = [model.str retain];
22. printf("str:%d \n", [model.str retainCount]);
23. printf("model:%d \n", [model retainCount]);
24. printf("str2:%d \n", [str2 retainCount]);
25. [model release];
26. model = nil;
27. printf("model:%d \n", [model retainCount]);
28. printf("str2:%d \n", [str2 retainCount]);
29. [pool release];
30. printf("str2:%d \n", [str2 retainCount]);
31. [str2 release];
32. /*
33. CGRect *rects = nil;
34. rects = (CGRect *)malloc(sizeof(CGRect) * 3);
35. rects[0] = CGRectMake(0, 0, 10, 10);
36. rects[1] = CGRectMake(1, 1, 10, 10);
37. rects[2] = CGRectMake(2, 2, 10, 10);
39. for (int i = 0; i < 3; i++) {
40. CGRect rect = *rects;
41. rects++;
42. NSLog(@"x:%f y:%f width:%f height:%f", rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
43. }
44. */