iOS Regular Codes

Hide keyboard on the outside click iOS

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    self.view.endEditing(true) //This will hide the keyboard
}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

self.view.endEditing(true) //This will hide the keyboard

}

How to hide Navigation Bar without losing slide-back ability Extend: UIGestureRecognizerDelegate

self.navigationController?.isNavigationBarHidden = true
self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
self.navigationController?.interactivePopGestureRecognizer?.delegate = self

self.navigationController?.isNavigationBarHidden = true

self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true

self.navigationController?.interactivePopGestureRecognizer?.delegate = self

Estimate the size of the cell according to text

 func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        
        let cgsiz = CGSize(width: self.view.frame.width , height:1000)
        let att = [NSFontAttributeName: UIFont.systemFont(ofSize: 14)]
        let estFram = NSString(string: self.tableData[indexPath.row].value).boundingRect(with: cgsiz, options: .usesLineFragmentOrigin, attributes: att, context: nil)
        let height = estFram.height + 40
        return height
 }

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

let cgsiz = CGSize(width: self.view.frame.width , height:1000)

let att = [NSFontAttributeName: UIFont.systemFont(ofSize: 14)]

let estFram = NSString(string: self.tableData[indexPath.row].value).boundingRect(with: cgsiz, options: .usesLineFragmentOrigin, attributes: att, context: nil)

let height = estFram.height + 40

return height

}

Change UIPageControl button on scroll Layout: Flow Scroll Direction: Horizontal Scrolling enabled Paging enabled

@IBOutlet weak var pageController: UIPageControl!
...
self.pageController.numberOfPages = self.imagesArray.count

...
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        pageController?.currentPage = Int(scrollView.contentOffset.x) / Int(scrollView.frame.width)
    }
    
    func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
        pageController?.currentPage = Int(scrollView.contentOffset.x) / Int(scrollView.frame.width)
    }

@IBOutlet weak var pageController: UIPageControl!

...

self.pageController.numberOfPages = self.imagesArray.count

...

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {

pageController?.currentPage = Int(scrollView.contentOffset.x) / Int(scrollView.frame.width)

}

func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {

pageController?.currentPage = Int(scrollView.contentOffset.x) / Int(scrollView.frame.width)

}

ios date

let tranDate:Date = Date()
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let tranDateResult = formatter.string(from: tranDate)

let tranDate:Date = Date()

let formatter = DateFormatter()

formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

let tranDateResult = formatter.string(from: tranDate)

Convert date to today or time

public static func dayDifference(from interval : TimeInterval) -> String {
        let calendar = NSCalendar.current
        let date = Date(timeIntervalSince1970: interval)
        if calendar.isDateInYesterday(date) { return "Yesterday" }
        else if calendar.isDateInToday(date) {
            
            let unixTimestamp = TimeInterval.self
            
            print(unixTimestamp)
            
            let date = Date(timeIntervalSince1970: interval)
            let dateFormatter = DateFormatter()
            //                dateFormatter.timeZone = TimeZone(abbreviation: "GMT") //Set timezone that you want
            dateFormatter.locale = NSLocale.current
            dateFormatter.dateFormat = "hh:mm a" //Specify your format that you want
            let strDate = dateFormatter.string(from: date)
            print(strDate)
            
            return strDate
            
        } else {
            let unixTimestamp = interval
            
            
            let date = Date(timeIntervalSince1970: unixTimestamp)
            let dateFormatter = DateFormatter()
            //                dateFormatter.timeZone = TimeZone(abbreviation: "GMT") //Set timezone that you want
            dateFormatter.locale = NSLocale.current
            dateFormatter.dateFormat = "dd/MM" //Specify your format that you want
            let strDate = dateFormatter.string(from: date)
            
            return strDate
            
        }
    }

public static func dayDifference(from interval : TimeInterval) -> String {

let calendar = NSCalendar.current

let date = Date(timeIntervalSince1970: interval)

if calendar.isDateInYesterday(date) { return "Yesterday" }

else if calendar.isDateInToday(date) {

let unixTimestamp = TimeInterval.self

print(unixTimestamp)

let date = Date(timeIntervalSince1970: interval)

let dateFormatter = DateFormatter()

// dateFormatter.timeZone = TimeZone(abbreviation: "GMT") //Set timezone that you want

dateFormatter.locale = NSLocale.current

dateFormatter.dateFormat = "hh:mm a" //Specify your format that you want

let strDate = dateFormatter.string(from: date)

print(strDate)

return strDate

} else {

let unixTimestamp = interval

let date = Date(timeIntervalSince1970: unixTimestamp)

let dateFormatter = DateFormatter()

// dateFormatter.timeZone = TimeZone(abbreviation: "GMT") //Set timezone that you want

dateFormatter.locale = NSLocale.current

dateFormatter.dateFormat = "dd/MM" //Specify your format that you want

let strDate = dateFormatter.string(from: date)

return strDate

}

[…]

shubham sharma October 15, 2018 Read More

Definations And Use :- Annotations

Annotation is Metadata. Metadata is data about data

public class AnnotationsSample {

    protected void execute() {
        Car car = new Car("Ford", "F150", "2018");
        JsonSerializer serializer = new JsonSerializer();
        try {
            serializer.serialize(car);
        } catch (JsonSerializeException e) {
            e.printStackTrace();
        }
    }
}

public class AnnotationsSample {

protected void execute() {

Car car = new Car("Ford", "F150", "2018");

JsonSerializer serializer = new JsonSerializer();

try {

serializer.serialize(car);

} catch (JsonSerializeException e) {

e.printStackTrace();

}

public class Car {
    @JsonField("manufacturer")
    private final String make;
    @JsonField
    private final String model;
    @IgnoreMe
    private final String year;
    public Car(String make, String model, String year) {
        this.make = make;
        this.model = model;
        this.year = year;
    }
    public String getMake() {
        return make;
    }
    public String getModel() {
        return model;
    }
    public String getYear() {
        return year;
    }
    @Override
    public String toString() {
        return year + " " + make + " " + model;
    }
}

public class Car {

@JsonField("manufacturer")

private final String make;

@JsonField

private final String model;

@IgnoreMe

private final String year;

public Car(String make, String model, String year) {

this.make = make;

this.model = model;

this.year = year;

}

public String getMake() {

return make;

}

public String getModel() {

return model;

}

public String getYear() {

return year;

}

@Override

public String toString() {

return year + " " + make + " " + model;

}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface IgnoreMe {
    String value() default "";
}

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)

@Target(ElementType.FIELD)

public @interface IgnoreMe {

String value() default "";

}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface JsonField {
    String value() default "";
}

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)

@Target(ElementType.FIELD)

public @interface JsonField {

String value() default "";

}

public class JsonSerializeException extends Exception {
    private static final long serialVersionUID = -8845242379503538623L;

    public JsonSerializeException(String message) {
        super(message);
    }
}

public class JsonSerializeException extends Exception {

private static final long serialVersionUID = -8845242379503538623L;

public JsonSerializeException(String message) {

super(message);

}

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;



public class JsonSerializer {
    private static String getSerializedKey(Field field) {
        String annotationValue = field.getAnnotation(JsonField.class).value();
        if (annotationValue.isEmpty()) {
            return field.getName();
        } else {
            return annotationValue;
        }
    }

    public String serialize(Object object) throws JsonSerializeException {
        try {
            Class<?> objectClass = requireNonNull(object).getClass();
            Map<String, String> jsonElements = new HashMap<>();
            for (Field field : objectClass.getDeclaredFields()) {

                field.setAccessible(true);
                if (field.isAnnotationPresent(JsonField.class)) {
                    jsonElements.put(getSerializedKey(field), (String) field.get(object));
                } else if (field.isAnnotationPresent(IgnoreMe.class)) {

                } else {
                    jsonElements.put(field.getName(), (String) field.get(object));
                }
            }
            System.out.println(toJsonString(jsonElements));
            return toJsonString(jsonElements);
        } catch (IllegalAccessException e) {
            throw new JsonSerializeException(e.getMessage());
        }
    }

    private Object requireNonNull(Object object) {
        if (object == null) {
            throw new NullPointerException();
        } else {
            return object;
        }

    }

    private String toJsonString(Map<String, String> jsonMap) {


        StringBuilder elementsString = new StringBuilder();
        for (Map.Entry<String, String> entry : jsonMap.entrySet())
            elementsString.append("\"").append(entry.getKey()).append("\":\"").append(entry.getValue()).append("\"");
        return "{" + elementsString + "}";
    }
}

import java.lang.reflect.Field;

import java.util.HashMap;

import java.util.Map;

public class JsonSerializer {

private static String getSerializedKey(Field field) {

String annotationValue = field.getAnnotation(JsonField.class).value();

if (annotationValue.isEmpty()) {

return field.getName();

} else {

return annotationValue;

}

public String serialize(Object object) throws JsonSerializeException {

try {

Class<?> objectClass = requireNonNull(object).getClass();

Map<String, String> jsonElements = new HashMap<>();

for (Field field : objectClass.getDeclaredFields()) {

field.setAccessible(true);

if (field.isAnnotationPresent(JsonField.class)) {

jsonElements.put(getSerializedKey(field), (String) field.get(object));

} else if (field.isAnnotationPresent(IgnoreMe.class)) {

} else {

jsonElements.put(field.getName(), (String) field.get(object));

}

System.out.println(toJsonString(jsonElements));

return toJsonString(jsonElements);

} catch (IllegalAccessException e) {

throw new JsonSerializeException(e.getMessage());

}

private Object requireNonNull(Object object) {

if (object == null) {

throw new NullPointerException();

} else {

return object;

}

private String toJsonString(Map<String, String> jsonMap) {

StringBuilder elementsString = new StringBuilder();

for (Map.Entry<String, String> entry : jsonMap.entrySet())

elementsString.append("\"").append(entry.getKey()).append("\":\"").append(entry.getValue()).append("\"");

return "{" + elementsString + "}";

}

shubham sharma September 11, 2018 Read More

Definations And Use :- Interface

What is Interface An interface in java is a blueprint of a class. Purposes of Interfaces create loosely coupled software support design by contract (an implementor must provide the entire interface) allow for pluggable software allow different objects to interact easily hide implementation details of classes from each other facilitate reuse of software It is used to achieve total […]

shubham sharma September 11, 2018 Read More

Common Issues

ViewPager PagerAdapter not updating the View

public int getItemPosition(Object object) {
    return POSITION_NONE;
}

public int getItemPosition(Object object) {

return POSITION_NONE;

}

shubham sharma September 10, 2018 Read More

ViewPager PagerAdapter not updating the View

There are several ways to achieve this. The first option is easier, but bit more inefficient. Override getItemPosition in your PagerAdapter like this:

public int getItemPosition(Object object) {
    return POSITION_NONE;
}

public int getItemPosition(Object object) {

return POSITION_NONE;

}

This way, when you call notifyDataSetChanged(), the view pager will remove all views and reload them all. As so the reload effect is obtained. The second option, suggested by Alvaro Luis Bustamante (previously alvarolb), is to setTag()method in instantiateItem() when […]

shubham sharma July 20, 2018 Read More

Moving and resizing DrawerLayout’s content on sliding

You can do this by translating and scaling the content View in the onDrawerSlide() method of a DrawerListener on your DrawerLayout. Since the content View itself is resizing, and there’s a separate TextView that appears in the bottom right corner, we’ll stick both of these in another holder ViewGroup. If that label TextView isn’t needed, the holder ViewGroup can be omitted, as well. A basic DrawerLayout setup for the example:

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#222222">

    <RelativeLayout android:id="@+id/holder"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout android:id="@+id/content"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="#E97411" />

            <ImageView android:id="@+id/main_content"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:background="#EEEEEE"
                android:src="@drawable/ic_launcher" />

        </LinearLayout>

        <TextView android:id="@+id/label"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignParentRight="true"
            android:visibility="gone"
            android:textSize="26dp"
            android:text="My App" />

    </RelativeLayout>

    <android.support.design.widget.NavigationView
        android:id="@+id/navigation_view"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="left"
        android:background="#555555" />

</android.support.v4.widget.DrawerLayout>

<android.support.v4.widget.DrawerLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/drawer_layout"