Ios5(三)屏幕的旋转和大小设置;

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Ios5(三)屏幕的旋转和大小设置;

一.     设置自动转屏的一般原则:

iphone类应用,如果为了增强用户体验,可以增加自动转屏功能,ipad应用,一般都应该添加自动转屏功能;

二.     自动转屏的实现方法:

1.    自动调整;

2.    看到视图旋转提示时,手动调整视图对象位置;

3.    在InterfaceBuilder中为视图设置两个不同的版本,一种为纵向模式,一种是横向模式;

三.     自动调整属性处理:

1.    打开项目设置,看:”Supported Device Orientations”可以更改支持的面向;即更改的info.plist的设置;

2.    在viewController.m文件中,添加方法:系统通过此方法询问视图控制器是否应该旋转到指定方向;

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{

    return(toInterfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}

3.    ios四个方向分别对应的常量:

                 UIInterfaceOrientationPortraitUpsideDown;

    UIInterfaceOrientationPortrait;

    UIInterfaceOrientationLandscapeLeft;

    UIInterfaceOrientationLandscapeRight;

4.    在xib,加入六个button,查看视图效果

5.    2

四.     旋转时重构视图:

1.    分别将六个按钮关联六个输出口,分别命名为:ul,ur,l,r,ll,lr;

2.    在旋转时重新构图:.m文件中重写方法:

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientationduration:(NSTimeInterval)duration{

   

    if(UIInterfaceOrientationIsPortrait(toInterfaceOrientation)){

        ul.frame =CGRectMake(20,20, 125, 125);

        ur.frame =CGRectMake(175,20, 125, 125);

        l.frame =CGRectMake(20,168, 125, 125);

        r.frame =CGRectMake(175,168, 125, 125);

        ll.frame =CGRectMake(20,315, 125, 125);

        lr.frame =CGRectMake(175,315, 125, 125);

    }else{

        ul.frame =CGRectMake(20,20, 125, 125);

        ur.frame =CGRectMake(20,155, 125, 125);

        l.frame =CGRectMake(177,20, 125, 125);

        r.frame =CGRectMake(177,155, 125, 125);

        ll.frame =CGRectMake(328,20, 125, 125);

        lr.frame =CGRectMake(328,155, 125, 125);

    }

}

3.    所有的视图的大小和位置都在frame属性中指定,该属性是一个类型为CGRect的结构;

4.    注意设备朝向的判定,可以用方法,也可以用字段;

五.     旋转时切换视图:

1.    重新建一个单视图项目,并复制视图,分别在两个视图中添加两个那妞,如图:

2.    定义一个角度弧度转换宏:#definedegreesToRadians(x)(M_PI*(x)/180.0)

3.    重现旋转的响应函数:

2- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientationduration:(NSTimeInterval)duration{

    if(UIInterfaceOrientationIsPortrait(toInterfaceOrientation)){

        self.view =portraint;

        self.view.transform =CGAffineTransformIdentity;

        self.view.transform =CGAffineTransformMakeRotation(degreesToRadians(0));

        self.view.bounds =CGRectMake(0.0,0.0, 320.0,460.0);

       

    }else if(UIInterfaceOrientationLandscapeLeft ==toInterfaceOrientation){

        self.view =landscape;

        self.view.transform =CGAffineTransformIdentity;

        self.view.transform =CGAffineTransformMakeRotation(degreesToRadians(-90));

        self.view.bounds =CGRectMake(0.0,0.0, 480.0,300.0);

       

    }else{

        self.view =landscape;

        self.view.transform =CGAffineTransformIdentity;

        self.view.transform =CGAffineTransformMakeRotation(degreesToRadians(90));

        self.view.bounds =CGRectMake(0.0,0.0, 480.0,300.0);

    }

}

 

4.    添加属性和操作:将两个视图的foo按钮同时关联outlet connection属性foos;Bar关联到bars;

为两个视图的所有按钮关联动作:buttonPressed:

- (IBAction)buttonTapped:(id)sender{

    NSString *mes = nil;

    if([self.fooscontainsObject:sender]){

        mes= @"Foo Button Pressed";

    }

    else{

        mes= @"Bar Button Pressed";

    }

    UIAlertView*alert = [[UIAlertViewalloc]initWithTitle:mesmessage:nildelegate:selfcancelButtonTitle:@"OK"otherButtonTitles:nil];

    [alert show];

}

 

IOS有输出口集合功能,可以同时指向多个元素,而输出口只能指向一个元素;

判断:

[self.foos containsObject:sender]返回BOOL值类型;

5.    如果希望点击按钮使两个按钮都消失可以使用数组的快速遍历:

 

- (IBAction)buttonTapped:(id)sender{

    if([fooscontainsObject:sender]){

        for(UIButton*onbuttonin foos){

           onbutton.hidden = YES;

        }

    }else{

        for(UIButton*onbuttonin bars){

           onbutton.hidden = YES;

        }

    }

}