About Memory

NSString *mm = [[NSString stringWithFormat:@"Minaki"] retain];
NSString *gg = [mm copy];
printf("mm----> %s      gg---->%s  \n", [mm UTF8String], [gg UTF8String]);
[mm release];
mm = [[NSString stringWithFormat:@"Lexi"] retain];
printf("mm----> %s      gg---->%s  \n", [mm UTF8String], [gg UTF8String]);
[mm release];
[gg release];

[self.window makeKeyAndVisible];


//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：
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
Model *model = [[Model alloc] init];
printf("str:%d \n", [model.str retainCount]);
printf("str:%d \n", [model.str retainCount]);
model.str = [NSString stringWithFormat:@"String"];
printf("str:%d \n", [model.str retainCount]);
model.arr = [NSArray arrayWithObjects:@"Array", nil];
NSString *str2 = [model.str retain];
printf("str:%d \n", [model.str retainCount]);
printf("model:%d \n", [model retainCount]);
printf("str2:%d \n", [str2 retainCount]);
[model release];
model = nil;
printf("model:%d \n", [model retainCount]);
printf("str2:%d \n", [str2 retainCount]);
[pool release];
printf("str2:%d \n", [str2 retainCount]);
[str2 release];
/*
CGRect *rects = nil;
rects = (CGRect *)malloc(sizeof(CGRect) * 3);
rects[0] = CGRectMake(0, 0, 10, 10);
rects[1] = CGRectMake(1, 1, 10, 10);
rects[2] = CGRectMake(2, 2, 10, 10);

for (int i = 0; i < 3; i++) {
CGRect rect = *rects;
rects++;
NSLog(@"x:%f   y:%f    width:%f    height:%f", rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
}
*/