3.CGRect

1. struct CGRect {
2. CGPoint origin;//偏移是相对父窗口的
3. CGSize size;
4. };
5. typedef struct CGRect CGRect;

这三个结构体均在一个头文件里：CGGeometry.h
二）几个方法

1.CGRectMake

1. - (BOOL)application:(UIApplication *)application
   didFinishLaunchingWithOptions:(NSDictionary
   *)launchOptions
2. {
3. self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen
   mainScreen] bounds]] autorelease];//系统帮你建画板
4. // Override point for customization after application
   launch.
5. //自己测试一下 bounds与aplicationFrame的区别
6. CGRect bound = [[UIScreen mainScreen]bounds];
7. NSLog(@"boundwidth:%f boundheight:%f ",bound.size.width,
   bound.size.height);
8. NSLog(@"boundx:%f boundy:%f ",bound.origin.x,
   bound.origin.y);
9. CGRect appBound = [[UIScreen
   mainScreen]applicationFrame];
10. NSLog(@"appBoundwidth:%f appBoundheight:%f
    ",appBound.size.width,appBound.size.height);
11. NSLog(@"appBoundx:%f appBoundy:%f ",appBound.origin.x,
    appBound.origin.y);
12. //画第一块画布然涂成蓝色，大小是320 X 100
13. CGRect CGone = CGRectMake(0.0, 0.0, 320,
    100);//画个矩形，初始化位置与大小
14. UIView *v_one = [[UIView
    alloc]initWithFrame:CGone];//初始化view
15. v_one.backgroundColor = [UIColor blueColor];// 涂成蓝色
16. [self.window addSubview:v_one];//直接加到画板上
17. //第二块注意它的位置
18. CGRect CGtwo = CGRectMake(0.0, 100, 160,
    100);//画个矩形、初始化位置与大小
19. UIView *v_two = [[UIView
    alloc]initWithFrame:CGtwo];//初始化view
20. v_two.backgroundColor = [UIColor redColor];//涂成红色
21. [self.window addSubview:v_two];//叠加到画板
22. //第三块注意他的位置
23. CGRect CGthree = CGRectMake(160, 100, 160, 100);//
24. UIView *v_three = [[UIView
    alloc]initWithFrame:CGthree];//
25. v_three.backgroundColor = [UIColor greenColor];//
26. [self.window addSubview:v_three];//
27. //第四块注意它的位置
28. CGRect CGfour = CGRectMake(0.0, 260, 320, 200);//
29. UIView *v_four = [[UIView
    alloc]initWithFrame:CGfour];//
30. v_four.backgroundColor = [UIColor orangeColor];//
31. [self.window addSubview:v_four];//
32. //第五块，计算一下它的位置，看看它的效果，
33. 你可以让试一下把这段代码移到第一快初始化的上面试试，会有意想不到的效果
34. CGRect CGfive = CGRectMake(100, 150, 160, 200);
35. UIView *v_five = [[UIView
    alloc]initWithFrame:CGfive];
36. v_five.backgroundColor = [UIColor yellowColor];
37. [self.window addSubview:v_five];
38. self.window.backgroundColor = [UIColor grayColor];//
39. [self.window makeKeyAndVisible];//
40. //最后记得release
41. [v_one release];
42. [v_two release];
43. [v_three release];
44. [v_four release];
45. [v_five release];
46. return YES;
47. }