如何在 swift 中在自定义导航栏顶部制作一半的 ImageView（swiftui自定义导航栏）

25-04-24 6

本文将介绍如何在swift中在自定义导航栏顶部制作一半的ImageView的详细情况，特别是关于swiftui自定义导航栏的相关信息。我们将通过案例分析、数据研究等多种方式，帮助您更全面地了解这个主题

本文将介绍如何在 swift 中在自定义导航栏顶部制作一半的 ImageView的详细情况，特别是关于swiftui自定义导航栏的相关信息。我们将通过案例分析、数据研究等多种方式，帮助您更全面地了解这个主题，同时也将涉及一些关于android 实现圆形 imageView,Circle imageView.、Android,ImageView over ImageView、Android：如何将 ImageView 的内容调整为与另一个 ImageView 内容相同的尺寸？、FitWidth ImageView 和 TopCrop ImageView的知识。

本文目录一览：

如何在 swift 中在自定义导航栏顶部制作一半的 ImageView（swiftui自定义导航栏）
android 实现圆形 imageView,Circle imageView.
Android,ImageView over ImageView
Android：如何将 ImageView 的内容调整为与另一个 ImageView 内容相同的尺寸？
FitWidth ImageView 和 TopCrop ImageView

如何在 swift 中在自定义导航栏顶部制作一半的 ImageView（swiftui自定义导航栏）

如何解决如何在 swift 中在自定义导航栏顶部制作一半的 ImageView

我正在为所有视图控制器使用自定义导航栏..但是在我的一个视图控制器中，我需要导航栏顶部的一半图像，该怎么做？请帮忙

像这样我需要

enter image description here

对于设计，我使用故事板，为此，我在 uiview 中拍摄了一个图像视图

uiview 约束

 top = 0,leading = 0,trailing = 0,height = 100

图像视图约束

 top = -40,horizontal center,height,width = 80

现在我变成这样了

enter image description here

我的自定义导航栏代码：请帮助我在一个视图控制器中的导航栏顶部制作图像视图

 func updateNavigationBar(with title : String,isTransparent : Bool = false,isBackNeed : Bool = true,isNotificationNeed : Bool = true,isMenuNeed : Bool = true){
    self.navigationController?.interactivePopGestureRecognizer?.delegate = nil
    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
    if isTransparent{
        self.navigationController?.navigationBar.setBackgroundImage(UIImage(),for: .default)
        self.navigationController?.navigationBar.shadowImage = UIImage()
        self.navigationController?.navigationBar.backgroundColor = .clear
        self.navigationController?.navigationBar.isTranslucent = true
        self.navigationController?.navigationBar.layer.shadowColor = UIColor.black.cgColor
        self.navigationController?.navigationBar.layer.shadowOpacity = 0
        self.navigationController?.navigationBar.layer.shadowOffset = CGSize.zero
        self.navigationController?.navigationBar.layer.shadowRadius = 0
    }else{
        self.navigationController?.navigationBar.shadowImage = UIImage()
        self.navigationController?.navigationBar.backgroundColor = CommonColor.navigationColor
        self.navigationController?.navigationBar.barTintColor = CommonColor.navigationColor
        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.navigationBar.layer.masksToBounds = false
        self.navigationController?.navigationBar.layer.shadowColor = UIColor.black.cgColor
        self.navigationController?.navigationBar.layer.shadowOpacity = 0.2
        self.navigationController?.navigationBar.layer.shadowOffset = CGSize(width: 0,height: 2.0)
        self.navigationController?.navigationBar.layer.shadowRadius = 2
    }
    let btnTitle = UIBarButtonItem(title: title,style: .plain,target: self,action: #selector(backClick))
    btnTitle.tintColor = .white
    
    let backImageView = UIImageView.init(image: CommonImage.back?.withRenderingMode(.alwaystemplate))
    backImageView.tintColor = .white
    backImageView.contentMode = .scaleAspectFit
    backImageView.frame = CGRect(x:0.0,y:0.0,width:20,height:25.0)
    backImageView.contentMode = .scaleAspectFit
    backImageView.widthAnchor.constraint(equalToConstant: 20).isActive = true
    backImageView.heightAnchor.constraint(equalToConstant: 25).isActive = true
    backImageView.addGestureRecognizer(UITapGestureRecognizer(target: self,action: #selector(backClick)))
    let btnBack = UIBarButtonItem(customView: backImageView)
    
    let menuImageView = UIImageView.init(image: CommonImage.menu?.withRenderingMode(.alwaystemplate))
    menuImageView.tintColor = .white
    menuImageView.contentMode = .scaleAspectFit
    menuImageView.frame = CGRect(x:0.0,width:25,height:25.0)
    menuImageView.contentMode = .scaleAspectFit
    menuImageView.widthAnchor.constraint(equalToConstant: 25).isActive = true
    menuImageView.heightAnchor.constraint(equalToConstant: 25).isActive = true
    menuImageView.addGestureRecognizer(UITapGestureRecognizer(target: self,action: #selector(menuClick)))
    let btnMenu = UIBarButtonItem(customView: menuImageView)
    
    let notificatonView = UIView()
    notificatonView.frame = CGRect(x:0.0,width:32,height:32.0)
    notificatonView.layer.cornerRadius = 8
    notificatonView.alpha = 0.5
    notificatonView.backgroundColor = .white
    notificatonView.clipsToBounds = true
    notificatonView.widthAnchor.constraint(equalToConstant: 32).isActive = true
    notificatonView.heightAnchor.constraint(equalToConstant: 32).isActive = true
    notificatonView.addGestureRecognizer(UITapGestureRecognizer(target: self,action: #selector(notificationClick)))
    
    let notificationBtn: BadgeButton = BadgeButton(type: .custom)
    notificationBtn.setimage(CommonImage.notification,for: .normal)
    notificationBtn.addAction(for: .touchUpInside) {
        
    }
    notificationBtn.frame = CGRect(x: 0,y: 0,width: 30,height: 30)
    notificationBtn.badgeBackgroundColor = CommonColor.navigationColor
    notificationBtn.badgeTextColor = .white
    if notificatonView.subviews.filter({$0 is BadgeButton}).count == 0{
        notificatonView.addSubview(notificationBtn)
        notificationBtn.center = notificatonView.center
    }
    let notificationBarButton = UIBarButtonItem(customView: notificatonView)
    if isBackNeed{
        self.navigationItem.setLeftBarButtonItems([btnBack,btnTitle],animated: true)
        self.navigationItem.setRightBarButtonItems( isNotificationNeed ? [notificationBarButton,btnMenu] : [notificationBarButton],animated: true)
    }else{
        self.navigationItem.setLeftBarButtonItems( isMenuNeed ? [btnMenu,btnTitle] : [btnTitle],animated: true)
        self.navigationItem.setRightBarButtonItems( isNotificationNeed ? [notificationBarButton] : nil,animated: true)
    }
}

如何在导航栏顶部显示一半的图像视图，请帮忙

解决方法

您需要创建自定义导航控制器，以便我们能够实现此类设计。

您需要使用这种方法 enter image description here

android 实现圆形 imageView,Circle imageView.

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设计给出了一个圆圈形显示网络图片的方案，无奈，程序猿只好写了一个，现共享出来，代码很简单。

类直接继承自 ImageView，修改下他的 canvas 就行了；

package cn.helloclq.android.widget;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.Path;
import android.graphics.Region;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * 
 * android circle imageView
 * @author Block Cheng
 *
 */
public class CircleImageView extends ImageView {

	Path path;
	public PaintFlagsDrawFilter mPaintFlagsDrawFilter;// 毛边过滤
	Paint paint;
	
	public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		// TODO Auto-generated constructor stub
		init();
	}

	public CircleImageView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
		init();
	}

	public CircleImageView(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
		init();
	}
	public void init(){
		mPaintFlagsDrawFilter = new PaintFlagsDrawFilter(0,
				Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);
		paint = new Paint();
		paint.setAntiAlias(true);
		paint.setFilterBitmap(true);
		paint.setColor(Color.WHITE);
		
	}
	
	@Override
	protected void onDraw(Canvas cns) {
		// TODO Auto-generated method stub
		float h = getMeasuredHeight()- 3.0f;
		float w = getMeasuredWidth()- 3.0f;
		if (path == null) {
			path = new Path();
	        path.addCircle(
	        		w/2.0f
	                , h/2.0f
	                , (float) Math.min(w/2.0f, (h / 2.0))
	                , Path.Direction.CCW);
	        path.close();
		}
		cns.drawCircle(w/2.0f, h/2.0f,  Math.min(w/2.0f, h / 2.0f) + 1.5f, paint);
		 int saveCount = cns.getSaveCount();
        cns.save();
        cns.setDrawFilter(mPaintFlagsDrawFilter);
        cns.clipPath(path,Region.Op.REPLACE);
        cns.setDrawFilter(mPaintFlagsDrawFilter);
        cns.drawColor(Color.WHITE);
		super.onDraw(cns);
		cns.restoreToCount(saveCount);
	}
	
}

原图片：

放到代码中测试运行

说明：该类对图片的裁剪，导致了轻微的毛边出来，采用网络上的方法处理了，效果不佳，详见代码中的 filter。

但如果服务器的图片是纯色背景，这个问题就不是问题了。我也不深入研究了，后面还有很重的任务。

另外，裁剪出圆形图片也是利用相似的原理实现。

如果哪位朋友有好的解决方法，欢迎分享给我，万分谢谢。

Android,ImageView over ImageView

我有一个非常简单的问题要问：我需要在屏幕右下方的ImageView上放一个小徽标,大屏幕,但我不知道如何设置坐标或怎么说ImageViews处于相对位置.

像这样的东西：

解决方法:

尝试这个

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/ic_launcher" />

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>

产量

Android：如何将 ImageView 的内容调整为与另一个 ImageView 内容相同的尺寸？

如何解决Android：如何将 ImageView 的内容调整为与另一个 ImageView 内容相同的尺寸？

我正在尝试将 ImageView 的内容调整为与另一个 ImageView 的内容相同的尺寸。例如，假设我有以下两张图片，其中一张是水平方向的，另一张是垂直方向的：

垂直图像：

enter image description here

水平图像：

enter image description here

我想将垂直图像调整为水平图像，如下所示：

enter image description here

最重要的是，ImageViews 的尺寸和它们的内容必须相同，如下面的横向 ImageView 截图所示：

enter image description here

我尝试为水平 BitMap 检索 ImageView 的尺寸并将垂直 ImageView 的 BitMap 重新缩放到水平 BitMap，但是为 BitMap 检索的尺寸始终显示原始水平照片的尺寸，而不是缩放以适合水平 ImageView 的照片尺寸。

以下是我迄今为止一直在工作的代码：

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <FrameLayout
        android:id="@+id/slider_screen_photo_layout"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="5dip"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingConstraints">
        <ImageView
            android:id="@+id/slider_screen_image_1_Box"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:maxHeight="370dp"
            android:scaleType="fitStart"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
        <ImageView
            android:id="@+id/slider_screen_image_2_Box"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:maxHeight="370dp"
            android:scaleType="matrix"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </FrameLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java（检索横向 ImageView 的位图尺寸）：

    ImageView sliderPreviewBox = null;
    if (photoNum == 1) {
        sliderPreviewBox = findViewById(R.id.slider_screen_image_1_Box);
    }
    if (photoNum == 2) {
        sliderPreviewBox = findViewById(R.id.slider_screen_image_2_Box);
    }
    Drawable drawable = sliderPreviewBox.getDrawable();
    int width = drawable.getIntrinsicWidth();
    int height = drawable.getIntrinsicHeight();

解决方法

试试这个：

onCreate..

Bitmap bitmap = BitmapFactory.decodeFile(MyPath);
try {
    int rotation = getExifOrientation(MyPath);
    Log.d(TAG,"\\n--- Rotation of the image " + name + " is: " + rotation);
} catch (IOException e) {
    e.printStackTrace();
}
Bitmap rot_bitmap = rotateBitmap(MyPath,bitmap);
imageView.setImageBitmap(rot_bitmap);

之后：


// To get the original orientation of the image
public static Bitmap rotateBitmap(String src,Bitmap bitmap) {
    try {
        // Getting the orientation of the image,there are 6 cases:
        // The Exif specification defines an Orientation Tag to indicate the orientation of the camera relative to the captured scene
        // Source: http://sylvana.net/jpegcrop/exif_orientation.html
        int rotation = getExifOrientation(src);
        if (rotation == 1) { return bitmap; }
        Matrix matrix = new Matrix();
        switch (rotation) {
            case 2: matrix.setScale(-1,1); break;
            case 3: matrix.setRotate(180); break;
            case 4: matrix.setRotate(180); matrix.postScale(-1,1); break;
            case 5: matrix.setRotate(90); matrix.postScale(-1,1); break;
            case 6: matrix.setRotate(90); break;
            case 7: matrix.setRotate(-90); matrix.postScale(-1,1); break;
            case 8: matrix.setRotate(-90); break;
            default: return bitmap;
        }
        // Creating a bitmap after its rotation and recycling the original one
        try {
            Bitmap oriented = Bitmap.createBitmap(bitmap,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
            // on low-memory system such as Android,must be attention to add bitmap.recycle(); to avoid the memory leak exception
            bitmap.recycle();
            return oriented;
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
            return bitmap;
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return bitmap;
}
// function to get the orientation of bitmap
private static int getExifOrientation(String src) throws IOException {
    int orientation = 1;
    ExifInterface exif = new ExifInterface(src);
    String orientationString=exif.getAttribute(ExifInterface.TAG_ORIENTATION);
    try { assert orientationString != null;
        orientation = Integer.parseInt(orientationString); }
    catch(NumberFormatException e) { e.printStackTrace(); }
        return orientation;
    }

FitWidth ImageView 和 TopCrop ImageView

FitWidth ImageView: 宽度自适应

[html] view plain copy print ?

<com.kk.drama.view.widget.FitWidthImageView
android:id="@+id/show_images"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/default_picture" />

[java] view plain copy print ?

public class FitWidthImageView extends ImageView
{
public FitWidthImageView(Context context) {
super(context);
setup();
}
public FitWidthImageView(Context context, AttributeSet attrs) {
super(context, attrs);
setup();
}
public FitWidthImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setup();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = width * getDrawable().getIntrinsicHeight() / getDrawable().getIntrinsicWidth();
setMeasuredDimension(width, height);
}
private void setup() {
setScaleType(ScaleType.CENTER_CROP);
}
}

TopCrop ImageView : 从头部 Crop 而不是 center

[html] view plain copy print ?

<com.kk.drama.view.widget.FitWidthImageView
android:id="@+id/show_images"
android:layout_width="match_parent"
android:layout_height="227dp"
android:src="@drawable/default_picture" />

自己改名

[java] view plain copy print ?

public class FitWidthImageView extends ImageView
{
public FitWidthImageView(Context context) {
super(context);
setup();
}
public FitWidthImageView(Context context, AttributeSet attrs) {
super(context, attrs);
setup();
}
public FitWidthImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setup();
}
private void setup() {
setScaleType(ScaleType.CENTER_CROP);
setScaleType(ScaleType.MATRIX);
}
@Override
protected boolean setFrame(int frameLeft, int frameTop, int frameRight, int frameBottom) {
float frameWidth = frameRight - frameLeft;
float frameHeight = frameBottom - frameTop;
float originalImageWidth = (float) getDrawable().getIntrinsicWidth();
float originalImageHeight = (float) getDrawable().getIntrinsicHeight();
float usedScaleFactor = 1;
if ((frameWidth > originalImageWidth) || (frameHeight > originalImageHeight)) {
// If frame is bigger than image
// => Crop it, keep aspect ratio and position it at the bottom and center horizontally
float fitHorizontallyScaleFactor = frameWidth / originalImageWidth;
float fitVerticallyScaleFactor = frameHeight / originalImageHeight;
usedScaleFactor = Math.max(fitHorizontallyScaleFactor, fitVerticallyScaleFactor);
}
float newImageWidth = originalImageWidth * usedScaleFactor;
float newImageHeight = originalImageHeight * usedScaleFactor;
Matrix matrix = getImageMatrix();
matrix.setScale(usedScaleFactor, usedScaleFactor, 0, 0); // Replaces the old matrix completly
// matrix.postTranslate((frameWidth - newImageWidth) / 2, frameHeight - newImageHeight);//BottomCrop
matrix.postTranslate((frameWidth - newImageWidth) / 2, 0);//Top Crop
setImageMatrix(matrix);
return super.setFrame(frameLeft, frameTop, frameRight, frameBottom);
}
}

今天关于如何在 swift 中在自定义导航栏顶部制作一半的 ImageView和swiftui自定义导航栏的分享就到这里，希望大家有所收获，若想了解更多关于android 实现圆形 imageView,Circle imageView.、Android,ImageView over ImageView、Android：如何将 ImageView 的内容调整为与另一个 ImageView 内容相同的尺寸？、FitWidth ImageView 和 TopCrop ImageView等相关知识，可以在本站进行查询。

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