ios - toques Empiezo, toques Terminado, toques Movido para mover UIView

objective-c xcode

Question

Necesito arrastrar mi objeto UIView. Yo uso este código, pero no funciona

float oldX, oldY;
BOOL dragging;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self];
if ([[touch.view class] isSubclassOfClass:[UILabel class]]) {
UILabel *label = (UILabel *)touch.view;
if (CGRectContainsPoint(label.frame, touchLocation)) {
dragging = YES;
oldX = touchLocation.x;
oldY = touchLocation.y;
}
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
dragging = NO;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self];
if ([[touch.view class] isSubclassOfClass:[UILabel class]]) {
UILabel *label = (UILabel *)touch.view;
if (dragging) {
CGRect frame = label.frame;
frame.origin.x = label.frame.origin.x + touchLocation.x - oldX;
frame.origin.y = label.frame.origin.y + touchLocation.y - oldY;
label.frame = frame;
}
}
}

Answer 1

Con este código podría mover mi objeto UIView a cualquier lugar. Mi ViewController.swift se ve así.

// code from below
import UIKit
class ViewController: UIViewController {
var location = CGPoint(x: 0, y: 0)
@IBOutlet weak var Person: UIImageView!
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
var touch : UITouch! = touches.first! as UITouch
location = touch.location(in: self.view)
Person.center = location
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
var touch : UITouch! = touches.first! as UITouch
location = touch.location(in: self.view)
Person.center = location
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
Person.center = CGPoint(x: 160, y: 330)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
//ends

Espero que ayude, aunque es otra forma de hacerlo que la mencionada en la pregunta.

Answer 2

Este es el código de trabajo para mover objetos UIView

float oldX, oldY; BOOL arrastrando;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:touch.view];
if ([[touch.view class] isSubclassOfClass:[UILabel class]]) {
dragging = YES;
oldX = touchLocation.x;
oldY = touchLocation.y;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
dragging = NO;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:touch.view];
if ([[touch.view class] isSubclassOfClass:[UILabel class]]) {
UILabel *label = (UILabel *)touch.view;
if (dragging) {
CGRect frame = label.frame;
frame.origin.x = label.frame.origin.x + touchLocation.x - oldX;
frame.origin.y = label.frame.origin.y + touchLocation.y - oldY;
label.frame = frame;
}
}
}

Answer 3

Hay algo un poco extraño en tu código.

Usted solicita la ubicación en self , algunas UIView que presumiblemente contienen la UILabel que desea verificar. Esto plantea la pregunta de por qué no agrega el touchesXXX a alguna subclase de UILabel suya.

Esto se cancela a medida que usa el label.frame que se define en términos de superview.bounds (su UIView principal a la que solicitó la ubicación de contacto), pero esto no es la forma más sencilla de seguir lo que es continuando

Answer 4

Yo sugeriría usar un UIPanGestureRecognizer :

-(void)dragging:(UIPanGestureRecognizer *)gesture
{
// Check if this is the first touch
if(gesture.state == UIGestureRecognizerStateBegan)
{
// Store the initial touch so when we change positions we do not snap
self.panCoord = [gesture locationInView:gesture.view];
[self.view bringSubviewToFront:gesture.view];
}
CGPoint newCoord = [gesture locationInView:gesture.view];
// Create the frame offsets to use our finger position in the view.
float dX = newCoord.x-self.panCoord.x;
float dY = newCoord.y-self.panCoord.y;
gesture.view.frame = CGRectMake(gesture.view.frame.origin.x+dX,
gesture.view.frame.origin.y+dY,
gesture.view.frame.size.width,
gesture.view.frame.size.height);
}

Esto es solo una preferencia mía. Para mí es mucho más sencillo usar un reconocedor de gestos y luego usar touchesBegan , touchesEnded , touchesMoved . Los UIPanGestureRecognizer en los casos en los que UIPanGestureRecognizer no funcionará.