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]
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。
修改强>
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
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;