- (
BOOL

)application:(

UIApplication

*)application

didFinishLaunchingWithOptions

:(

NSDictionary

*)launchOptions
{
self

.window

= [[UIWindow

alloc

]

initWithFrame

:[[UIScreen

mainScreen

]

bounds

]];
// Override point for customization after application launch.
self

.window

.backgroundColor

= [UIColor

whiteColor

];
UIView* testView = [[UIView

alloc

]

initWithFrame

:CGRectMake(

5

0

,

5

0

,

1

0

0

,

1

0

0

)];
testView

.backgroundColor

= [UIColor

redColor

];
[

self

.window

addSubview

:testView];
NSLog(

@"Frame: (%.2f, %.2f, %.2f, %.2f)"

, testView

.frame

.origin

.x

, testView

.frame

.origin

.y

, testView

.frame

.size

.width

, testView

.frame

.size

.height

);

NSLog(

@"Bounds: (%.2f, %.2f, %.2f, %.2f)"

, testView

.bounds

.origin

.x

, testView

.bounds

.origin

.y

, testView

.bounds

.size

.width

, testView

.bounds

.size

.height

);

NSLog(

@"Center: (%.2f, %.2f)"

, testView

.center

.x

, testView

.center

.y

);

[

self

.window

 makeKeyAndVisible

];

return

YES

;

}

输出：

[objc]

view plain

copy

Frame: (

5

0

.00

,

5

0

.00

,

1

0

0

.00

,

1

0

0

.00

)
Bounds: (

0

.00

,

0

.00

,

1

0

0

.00

,

1

0

0

.00

)
Center: (

1

0

0

.00

,

1

0

0

.00

)

运行界面：

image

图1

由于视图的定位一定需要针对父视图，而不是针对自己，所以bounds属性并不能够决定当前视图的位置（因为它与父视图根本无关，就谈不上定位），所以bounds属性与center属性是完全独立的，前者规定尺寸，后者定义位置。换句话说，修改bounds不影响center；修改center不影响bounds。（《iOS应用程序开发方法与实践》中讲到当修改bounds时center会更改，这是一个错误。特附此文。）

默认情况下，当视图创建后，其自己的坐标系原点(0, 0)位于其左上角位置。不过，本地原点位置是会随时发生变化的。例如将bounds由最初的(0, 0, 100, 100)修改为(50, 50, 100, 100)，则意味着本地原点向左向上移动了50。由于位置和尺寸都未发生变化，所以frame属性与center属性不变。在[self.window makeKeyAndVisible];语句之前加入下面的代码：

[objc]

view plain

copy

NSLog(

@"Modify Bounds to (50, 50, 100, 100)"

);
testView

.bounds

= CGRectMake(

5

0

,

5

0

,

1

0

0

,

1

0

0

);
NSLog(

@"Frame: (%.2f, %.2f, %.2f, %.2f)"

, testView

.frame

.origin

.x

, testView

.frame

.origin

.y

, testView

.frame

.size

.width

, testView

.frame

.size

.height

);
NSLog(

@"Bounds: (%.2f, %.2f, %.2f, %.2f)"

, testView

.bounds

.origin

.x

, testView

.bounds

.origin

.y

, testView

.bounds

.size

.width

, testView

.bounds

.size

.height

);
NSLog(

@"Center: (%.2f, %.2f)"

, testView

.center

.x

, testView

.center

.y

);

输出：

[objc]

view plain

copy

Modify Bounds to (

5

0

,

5

0

,

1

0

0

,

1

0

0

)
Frame: (

5

0

.00

,

5

0

.00

,

1

0

0

.00

,

1

0

0

.00

)
Bounds: (

5

0

.00

,

5

0

.00

,

1

0

0

.00

,

1

0

0

.00

)
Center: (

1

0

0

.00

,

1

0

0

.00

)

运行界面依然是图1。

再例如将bounds由最初的(0, 0, 100, 100)修改为(0, 0, 140, 140)，则本地原点向左向上移动20。frame属性变为(30, 30, 140, 140)，center属性不变，仍然是(100, 100)。

[objc]

view plain

copy

NSLog(

@"Modify Bounds to (0, 0, 140, 140)"

);
testView

.bounds

= CGRectMake(

0

,

0

,

1

4

0

,

1

4

0

);
NSLog(

@"Frame: (%.2f, %.2f, %.2f, %.2f)"

, testView

.frame

.origin

.x

, testView

.frame

.origin

.y

, testView

.frame

.size

.width

, testView

.frame

.size

.height

);
NSLog(

@"Bounds: (%.2f, %.2f, %.2f, %.2f)"

, testView

.bounds

.origin

.x

, testView

.bounds

.origin

.y

, testView

.bounds

.size

.width

, testView

.bounds

.size

.height

);
NSLog(

@"Center: (%.2f, %.2f)"

, testView

.center

.x

, testView

.center

.y

);

输出：

[plain]

view plain

copy

Modify Bounds to (0, 0, 140, 140)
Frame: (30.00, 30.00, 140.00, 140.00)
Bounds: (0.00, 0.00, 140.00, 140.00)
Center: (100.00, 100.00)

运行界面：

image

图2

现在我们把testView改回为最初的状态，并在其中添加一个子视图greenView。

[objc]

view plain

copy

- (
BOOL

)application:(

UIApplication

*)application

didFinishLaunchingWithOptions

:(

NSDictionary

*)launchOptions
{
self

.window

= [[UIWindow

alloc

]

initWithFrame

:[[UIScreen

mainScreen

]

bounds

]];
// Override point for customization after application launch.
self

.window

.backgroundColor

= [UIColor

whiteColor

];
UIView* testView = [[UIView

alloc

]

initWithFrame

:CGRectMake(

5

0

,

5

0

,

1

0

0

,

1

0

0

)];
testView

.backgroundColor

= [UIColor

redColor

];
[

self

.window

addSubview

:testView];
UIView* greenView = [[UIView

alloc

]

 initWithFrame

:CGRectMake(

3

0

, 

3

0

, 

8

0

, 

8

0

)];

greenView

.backgroundColor

 = [UIColor

 greenColor

];

[testView

addSubview

:greenView];

NSLog(

@"testView Frame: (%.2f, %.2f, %.2f, %.2f)"

, testView

.frame

.origin

.x

, testView

.frame

.origin

.y

, testView

.frame

.size

.width

, testView

.frame

.size

.height

);

NSLog(

@"testView Bounds: (%.2f, %.2f, %.2f, %.2f)"

, testView

.bounds

.origin

.x

, testView

.bounds

.origin

.y

, testView

.bounds

.size

.width

, testView

.bounds

.size

.height

);

NSLog(

@"testView Center: (%.2f, %.2f)"

, testView

.center

.x

, testView

.center

.y

);

NSLog(

@"greenView Frame: (%.2f, %.2f, %.2f, %.2f)"

, greenView

.frame

.origin

.x

, greenView

.frame

.origin

.y

, greenView

.frame

.size

.width

, greenView

.frame

.size

.height

);

NSLog(

@"greenView Bounds: (%.2f, %.2f, %.2f, %.2f)"

, greenView

.bounds

.origin

.x

, greenView

.bounds

.origin

.y

, greenView

.bounds

.size

.width

, greenView

.bounds

.size

.height

);

NSLog(

@"greenView Center: (%.2f, %.2f)"

, greenView

.center

.x

, greenView

.center

.y

);

[

self

.window

 makeKeyAndVisible

];

return

YES

;

}

输出：

[plain]

view plain

copy

testView Frame: (50.00, 50.00, 100.00, 100.00)
testView Bounds: (0.00, 0.00, 100.00, 100.00)
testView Center: (100.00, 100.00)
greenView Frame: (30.00, 30.00, 80.00, 80.00)
greenView Bounds: (0.00, 0.00, 80.00, 80.00)
greenView Center: (70.00, 70.00)

界面：

image

图3

然后在[self.window makeKeyAndVisible];语句之前加入下面的代码，将testView的bounds改为(50, 50, 100, 100)：

[objc]

view plain

copy

NSLog(

@"Modify testView Bounds to (50, 50, 100, 100)"

);
testView

.bounds

= CGRectMake(

5

0

,

5

0

,

1

0

0

,

1

0

0

);
NSLog(

@"testView Frame: (%.2f, %.2f, %.2f, %.2f)"

, testView

.frame

.origin

.x

, testView

.frame

.origin

.y

, testView

.frame

.size

.width

, testView

.frame

.size

.height

);
NSLog(

@"testView Bounds: (%.2f, %.2f, %.2f, %.2f)"

, testView

.bounds

.origin

.x

, testView

.bounds

.origin

.y

, testView

.bounds

.size

.width

, testView

.bounds

.size

.height

);
NSLog(

@"testView Center: (%.2f, %.2f)"

, testView

.center

.x

, testView

.center

.y

);
NSLog(

@"greenView Frame: (%.2f, %.2f, %.2f, %.2f)"

, greenView

.frame

.origin

.x

, greenView

.frame

.origin

.y

, greenView

.frame

.size

.width

, greenView

.frame

.size

.height

);
NSLog(

@"greenView Bounds: (%.2f, %.2f, %.2f, %.2f)"

, greenView

.bounds

.origin

.x

, greenView

.bounds

.origin

.y

, greenView

.bounds

.size

.width

, greenView

.bounds

.size

.height

);
NSLog(

@"greenView Center: (%.2f, %.2f)"

, greenView

.center

.x

, greenView

.center

.y

);

输出：

[plain]

view plain

copy

testView Frame: (50.00, 50.00, 100.00, 100.00)
testView Bounds: (0.00, 0.00, 100.00, 100.00)
testView Center: (100.00, 100.00)
greenView Frame: (30.00, 30.00, 80.00, 80.00)
greenView Bounds: (0.00, 0.00, 80.00, 80.00)
greenView Center: (70.00, 70.00)
Modify testView Bounds to (50, 50, 100, 100)
testView Frame: (50.00, 50.00, 100.00, 100.00)
testView Bounds: (50.00, 50.00, 100.00, 100.00)
testView Center: (100.00, 100.00)
greenView Frame: (30.00, 30.00, 80.00, 80.00)
greenView Bounds: (0.00, 0.00, 80.00, 80.00)
greenView Center: (70.00, 70.00)

界面：

image

图4

由于testView自己坐标的原点被移动到了屏幕的左上角位置，所以greenView在界面上的位置也相应发生了变化。所以，当修改了视图自身的原点位置时，不会影响其自身的位置，而会影响到其子视图的位置。

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