当我改变方向时,我的视图的高度和宽度不会改变

时间:2016-02-20 09:38:23

标签: ios objective-c iphone orientation

我在默认视图的子视图中使用了一个视图。我试图将其高度和宽度设置为与超级视图相同,当它改变方向时。首先,当应用程序加载纵向模式时,此子视图采用完美的高度宽度,但是当第二次我们更改为纵向模式时,它不是更改高度和宽度。 在加载: -

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    [[NSNotificationCenter defaultCenter]
     addObserver:self selector:@selector(orientationChanged:)
     name:UIDeviceOrientationDidChangeNotification
     object:[UIDevice currentDevice]];

方法: -

- (void) orientationChanged:(NSNotification *)note
{
    UIDevice * device = note.object;
    switch(device.orientation)
    {
        case UIDeviceOrientationPortrait:
            NSLog(@"Portrait");
            NSLog(@"View Height %f",self.view.frame.size.height);
            NSLog(@"View Width%f",self.view.frame.size.width);

            view1.frame=CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);

            NSLog(@"View1 Height %f",view1.frame.size.height);
            NSLog(@"View1 Width%f",view1.frame.size.width);

            break;

        case UIDeviceOrientationLandscapeRight:
            NSLog(@" LanScapRight");


             view1.frame=CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.height, self.view.frame.size.width);



            break;
        case UIDeviceOrientationLandscapeLeft:

            NSLog(@" LandScapLeft");

            view1.frame=CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);


        default:
            view1.frame=CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);


            NSLog(@"Default");

            //view1.frame=CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.height, self.view.frame.size.width);


            break;
    };
}

输出:-(问题)

2016-02-20 01:29:15.907 Editing[4999:95632] Portrait
[![2016-02-20 01:29:15.910 Editing\[4999:95632\] View Height 568.000000
2016-02-20 01:29:15.910 Editing\[4999:95632\] View Width320.000000
2016-02-20 01:29:15.911 Editing\[4999:95632\] View1 Height 568.000000
2016-02-20 01:29:15.912 Editing\[4999:95632\] View1 Width320.000000
2016-02-20 01:29:39.090 Editing\[4999:95632\] LanScapRight
2016-02-20 01:29:40.364 Editing\[4999:95632\] Default
2016-02-20 01:29:41.645 Editing\[4999:95632\] LandScapLeft
2016-02-20 01:29:41.646 Editing\[4999:95632\] Default
2016-02-20 01:29:43.316 Editing\[4999:95632\] Portrait
2016-02-20 01:29:43.317 Editing\[4999:95632\] View Height 320.000000
2016-02-20 01:29:43.317 Editing\[4999:95632\] View Width568.000000
2016-02-20 01:29:43.317 Editing\[4999:95632\] View1 Height 320.000000
2016-02-20 01:29:43.318 Editing\[4999:95632\] View1 Width568.000000]

enter image description here

enter image description here

3 个答案:

答案 0 :(得分:1)

[self.view setNeedsDisplay]; 

在上面的开关盒上使用此代码,此代码用于重新加载 查看,以便获得更新的视图宽度和高度。

答案 1 :(得分:1)

如果您只是希望视图具有其超视图的界限并且不使用自动布局,则只要超视图的边界发生变化,具有灵活高度和宽度的自动调整遮罩应该只设置正确的帧。

修改

您正在将子视图的帧的原点设置为超级视图的原点 - 我怀疑这不是预期的。如果超级视图从(0,0)移动,则会将子视图的原点移动相对于窗口的两倍移位。

答案 2 :(得分:1)

由于界面方向改变而更新UI是一项相当常见的任务,因此有一个很好的支持方法来执行此操作。

解决方案1:

如果您使用基于帧的布局(如示例代码中所示),建议将您的帧设置代码放入视图的layoutSubviews中,如Jan Greve所评论的那样。要做到这一点,你必须继承UIView。每当视图边界发生变化时,都会调用layoutSubviews方法,因此您不必观察有关界面方向的通知,并且您还可以对其他大小变化事件做出反应,例如:多任务分裂视图。这是一个超级最小的例子,如何子类化UIView并实现布局:

// MyView.h

#import <UIKit/UIKit.h>

@interface MyView : UIView

@property (strong) UIView* view1;
@property (strong) UIView* calendar;

@end

// MyView.m

#import "MyView.h"

@implementation MyView

- (instancetype)init {
    self = [super init];
    if (self) {
        self.view1 = [[UIView alloc] init];
        self.view1.backgroundColor = [UIColor grayColor];
        [self addSubview:self.view1];
        self.calendar = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 300)];
        self.calendar.backgroundColor = [UIColor redColor];
        [self.view1 addSubview:self.calendar];
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    self.view1.frame = self.bounds;
    self.calendar.center = self.view1.center;
}

@end

如果将MyView实例设置为viewcontroller的view属性,它就可以正常工作。

解决方案2:

解决方案1通常可以使用,但在您的特定情况下,可以通过自动调整掩码来完成布局。 (在这里,我必须再次向Jan Greve请求,他在答案中推荐了这个。)现在你不需要子类UIView,可以从viewcontroller处理所有东西。您可以在viewDidLoad

中插入这样的内容
UIView* view1 = [[UIView alloc] initWithFrame:self.view.frame];
view1.backgroundColor = [UIColor grayColor];
[self.view addSubview:view1];
view1.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

UIView* calendar = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 300)];
calendar.backgroundColor = [UIColor redColor];
[view1 addSubview:calendar];
calendar.center = view1.center;
calendar.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;