Several common gestures for uiimageview in iOS development

//

Viewcontroller.m

05- gestures

//

Created by Wanghy on 15/9/21.

Copyright (c) year Wanghy. All rights reserved.

//

#import "ViewController.h"

@interface viewcontroller ()

@property (weak, nonatomic) iboutlet uiimageview* imageView;

@end

@implementation Viewcontroller

-(void) viewdidload

{

[Super viewdidload];

additional setup after loading the view, typically from a nib.

//1. create an object for a gesture

//2. add the object of the gesture to the view that requires gestures

//3. ways to implement gestures

//uitapgesturerecognizer ( percussion )-------------

//// 1. objects that create gestures

//uitapgesturerecognizer* tap = [[UITapGestureRecognizer alloc] initwithtarget:self action: @selector (tap:)];

//// several fingers

//tap.numberoftouchesrequired = 2;

//// point a few times

//tap.numberoftapsrequired = 2;

//// 2. Adding gestures to ImageView

//[Self.imageview Addgesturerecognizer:tap];

//// 3. Implementation Method

//uiswipegesturerecognizer (swipe )-------------

//1.

Uiswipegesturerecognizer* swipe = [[uiswipegesturerecognizer alloc] initwithtarget :self action:@selector(swipe:)];

Uiswipegesturerecognizer* swipe1 = [[uiswipegesturerecognizer alloc] initwithtarget :self action:@selector(swipe:)];

// slide left

Swipe. direction = uiswipegesturerecognizerdirectionleft;

//2.

[self. ImageView addgesturerecognizer: swipe];

[self. ImageView addgesturerecognizer: swipe1];

//uilongpressgesturerecognizer ( Long press )-------------

//1.

Uilongpressgesturerecognizer* longpress = [[uilongpressgesturerecognizer alloc] Initwithtarget:self action:@selector(longpress:)];

// long-Press how long it takes to execute the method

Longpress. minimumpressduration = 2;

// error

Longpress. allowablemovement = ten;

//2.

[self. ImageView addgesturerecognizer: longpress];

//uirotationgesturerecognizer ( swivel )-------------

//1

Uirotationgesturerecognizer* rotation = [[uirotationgesturerecognizer alloc] Initwithtarget:self action:@selector(rotation:)];

//2.

[self. ImageView addgesturerecognizer: rotation];

//uipinchgesturerecognizer ( Pinch, for zooming )-------------

//1.

uipinchgesturerecognizer* pinch = [[uipinchgesturerecognizer alloc] initwithtarget :self action:@selector(pinch:)];

//2.

[self. ImageView Addgesturerecognizer:p inch];

//uipangesturerecognizer ( drag )-------------

//1.

uipangesturerecognizer* pan = [[uipangesturerecognizer alloc] initwithtarget: Self action:@selector(pan:)];

//2.

[self. ImageView Addgesturerecognizer:p an];

}

dragging

-(void) Pan: (uipangesturerecognizer*) sender

{

cgpoint p = [Sender translationinview:self. ImageView];

self. ImageView. Transform = cgaffinetransformtranslate(self. ImageView. Transform, p.x, p.y);

[Sender settranslation:cgpointzero inview:self. ImageView];

}

kneading

-(void) Pinch: (uipinchgesturerecognizer*) sender

{

//Self.imageView.transform = Cgaffinetransformmakescale (Sender.scale, sender.scale);

self. ImageView. Transform = Cgaffinetransformscale(self. ImageView. Transform, sender. Scale, sender. Scale);

Sender. scale = 1;

}

Rotate

-(void) Rotation: (uirotationgesturerecognizer*) sender

{

NSLog(@ "%f", sender. Rotation);

self. ImageView. Transform = cgaffinetransformrotate(self. ImageView. Transform, sender. Rotation);

Sender. rotation = 0;

//Self.imageView.transform = Cgaffinetransformmakerotation (sender.rotation);

}

Long Press

-(void) longpress: (uilongpressgesturerecognizer*) sender

{

// just want to start by executing a code that needs to determine the state of the gesture

if (sender. state = = Uigesturerecognizerstatebegan) {

NSLog(@ "longpress");

}

}

Swipe

-(void) Swipe: (uiswipegesturerecognizer*) sender

{

if (sender. Direction = = Uiswipegesturerecognizerdirectionleft) {

NSLog(@ "left");

}

else {

NSLog(@ "right");

}

}

percussion

-(void) Tap: (uitapgesturerecognizer*) sender

{

NSLog(@ "tap");

}

@end

Several common gestures for uiimageview in iOS development