You need to first change the constraint and then animate the update. This should be in the superview. self.nameInputConstraint.constant = 8 Swift 2 UIView.animateWithDuration(0.5) { self.view.layoutIfNeeded() } Swift 3, 4, 5 UIView.animate(withDuration: 0.5) { self.view.layoutIfNeeded() }
CHECK constraints are not supported by MySQL. You can define them, but they do nothing (as of MySQL 5.7). From the manual: The CHECK clause is parsed but ignored by all storage engines. The workaround is to create triggers, but they aren’t the easiest thing to work with. If you want an open-source RDBMS that … Read more
This will change the column to be case sensitive. I don’t think there’s any change to your constraint… ALTER TABLE mytable ALTER COLUMN mycolumn VARCHAR(10) COLLATE SQL_Latin1_General_CP1_CS_AS Any selects or joins on this column will become case sensitive as a result of this operation.
Since PostgreSQL 9.6 you have the num_nonnulls and num_nulls comparison functions that accept any number of VARIADIC arguments. For example, this would make sure exactly one of the three columns is not null. ALTER TABLE your_table ADD CONSTRAINT chk_only_one_is_not_null CHECK (num_nonnulls(col1, col2, col3) = 1); History & References The PostgreSQL 9.6.0 Release Notes from 2016-09-29 … Read more
Read also the discussion here: Generics and sorting in Java Short answer, the best you can get is: class ListObject<T extends Comparable<? super T>> { … } But there is also reason to just use: class ListObject<T extends Comparable> { … }
Because the PRIMARY KEY makes the included column(s) NOT NULL automatically. I quote the manual here: The primary key constraint specifies that a column or columns of a table can contain only unique (non-duplicate), nonnull values. Technically, PRIMARY KEY is merely a combination of UNIQUE and NOT NULL. Bold emphasis mine. I ran a test … Read more
You can use a check constraint e.g. constraint chk_education check (schoolName is not null or studiedAt is not null) From the manual: A check constraint is the most generic constraint type. It allows you to specify that the value in a certain column must satisfy a Boolean (truth-value) expression. Edit: Alternative to comply with Pithyless’ … Read more
RIP, Constraints! SwiftUI doesn’t use layout constraints. UIKit is still around, it’s not deprecated and fully functional, so if you continue to use the classic approach, you can use as many constraints as you wish. However, if you choose to go with SwiftUI → rest in peace, constraints! The core concept to align views with … Read more
It looks like that the autolayout visual format parsing engine is interpreting the “.” in your VFL constraint to be a keyPath instead of a key like it’s using valueForKeyPath:. NSDictionaryOfVariableBindings(…) will take whatever your parameter is in the parenthesis and translate it into a literal key with the object as the value (in your … Read more
This layout works in my app. The trick is to set these two attributes in ScrollView: android:layout_height=”0dp” app:layout_constraintBottom_toBottomOf=”parent” The simplified layout from my app: <?xml version=”1.0″ encoding=”utf-8″?> <android.support.constraint.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” android:theme=”@style/ThemeOverlay.AppCompat.Light”> <RelativeLayout android:id=”@+id/linear” android:layout_width=”0dp” android:layout_height=”56dp” android:background=”@color/title” app:layout_constraintLeft_toLeftOf=”parent” app:layout_constraintRight_toRightOf=”parent” app:layout_constraintTop_toTopOf=”parent” /> <ScrollView android:layout_width=”0dp” android:layout_height=”0dp” app:layout_constraintBottom_toBottomOf=”parent” app:layout_constraintLeft_toLeftOf=”parent” app:layout_constraintRight_toRightOf=”parent” app:layout_constraintTop_toBottomOf=”@id/linear”> <android.support.constraint.ConstraintLayout android:layout_width=”match_parent” android:layout_height=”wrap_content”> <TextView android:id=”@+id/titleView” … Read more