記憶體管理:
student *student = [[student alloc] initwithname:@"小王"];
nslog(@"%lu", [student retaincount]);//1
myclass *myclass = [[myclass alloc] init];
nslog(@"%lu", [myclass retaincount]);//1
[myclass setstudent:student];
nslog(@"%lu", [student retaincount]);//2
nslog(@"%lu", [myclass retaincount]);//1
[student release];
nslog(@"%lu", [student retaincount]);//1
nslog(@"%lu", [myclass retaincount]);//1
[myclass setstudent:student];
nslog(@"%lu", [student retaincount]);//1
nslog(@"%lu", [myclass retaincount]);//1
student *stu = [myclass student];
nslog(@"%lu", [student retaincount]);//2
nslog(@"%lu", [myclass retaincount]);//1
[myclass release];
nslog(@"%lu", [student retaincount]);//1
// nslog(@"%lu", [myclass retaincount]);//crash
[stu sayhi];
2015/2/9 19:36:08
兒子 2015/2/9 19:36:08
// 申請記憶體 逐一釋放（每個人控制自己的開關）把下列輸出裡的stu換成stu1或者stu2也一樣
collegestudent *stu = [[collegestudent alloc] init];
nslog(@"retaincount = %lu", [stu retaincount]);//1
collegestudent *stu1 = [stu retain];// 或者
[stu1 retain];//如果有這一步，變成//1 //3 //4 //3 //2 //1
nslog(@"retaincount = %lu", [stu retaincount]);//2
collegestudent *stu2 = [stu retain];
nslog(@"retaincount = %lu", [stu retaincount]);//3
[stu2 release];
nslog(@"retaincount = %lu", [stu retaincount]);//2
[stu1 release];
nslog(@"retaincount = %lu", [stu retaincount]);//1
[stu release];
nslog(@"retaincount = %lu", [stu retaincount]);//1 //理論是0， 實際是1 在未來某一時刻自動釋放
2015/2/9 19:39:44
兒子 2015/2/9 19:39:44
// 申請記憶體 逐一釋放（每個人控制自己的開關）把下列輸出裡的stu換成stu1或者stu2也一樣
collegestudent *stu = [[collegestudent alloc] init];
nslog(@"retaincount = %lu", [stu retaincount]);//1
collegestudent *stu1 = [stu retain];//功能和[stu1 retain]一樣
nslog(@"retaincount = %lu", [stu retaincount]);//2
[stu1 retain];
nslog(@"retaincount = %lu", [stu retaincount]);//3
collegestudent *stu2 = [stu retain];
nslog(@"retaincount = %lu", [stu retaincount]);//4
[stu2 release];
nslog(@"retaincount = %lu", [stu retaincount]);//3
[stu1 release];
nslog(@"retaincount = %lu", [stu retaincount]);//2
[stu release];
nslog(@"retaincount = %lu", [stu retaincount]);//1 //理論是0， 實際是1 在未來某一時刻自動釋放
OC 記憶體管理的重點
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Oc 記憶體管理
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