单指移动光标手势，双指修改文本选区手势

来源：互联网发布：java教程视频百度云盘编辑：程序博客网时间：2024/06/16 19:41
UIView通过实现UITextInput协议，实现单指移动光标手势，双指修改文本选区手势。
分别使用了UIPanGestureRecognizer和UIPinchGestureRecognizer手势。
#import "ViewController.h"#import "JSWebView.h"#import "UIView+Constriant.h"#import "JSInputView.h"#import "UIResponder+FirstResponder.h"#import "NSObject+SetFrame.h"#import "WebViewJavascriptBridge.h"@interface ViewController () <UIWebViewDelegate>@property (nonatomic, strong) JSWebView *webView;@property (nonatomic, strong) NSLayoutConstraint *bottomConstraint;//@property WebViewJavascriptBridge* bridge;@property (nonatomic, assign) CGPoint lastPoint;@property (nonatomic, assign) CGPoint startPoint0;@property (nonatomic, assign) CGPoint startPoint1;@property (nonatomic, assign) CGRect lastRect0;@property (nonatomic, assign) CGRect lastRect1;@property (nonatomic, assign) CGRect startRect0;@property (nonatomic, assign) CGRect startRect1;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    /*……*/    //单指移动光标手势        UIPanGestureRecognizer *singleFingerPanRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(singleFingerMoveCursor:)];    singleFingerPanRecognizer.maximumNumberOfTouches = 1;    [self.webView.keyboard addGestureRecognizer:singleFingerPanRecognizer];    //双指选择选区手势    UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchSelect:)];    [self.webView.keyboard addGestureRecognizer:pinchGesture];    self.lastRect0 = CGRectMake(0, 0, 1, 19);    self.lastRect1 = CGRectMake(0, 0, 1, 19);    self.startPoint0 = CGPointMake(0, 0);    self.startPoint1 = CGPointMake(0, 0);    self.lastPoint = CGPointMake(0, 0);    [self loadWeb];}#pragma mark - keyboard gesture//单个手指移动光标- (void)singleFingerMoveCursor: (UIPanGestureRecognizer *)sender {    UIResponder <UITextInput>*textInput = [UIResponder currentFirstResponder];    if (sender.state == UIGestureRecognizerStateBegan) {        self.lastPoint = CGPointMake(0, 0);        CGPoint cursorPoint = [textInput caretRectForPosition:textInput.selectedTextRange.start].origin;        self.lastRect0 = CGRectMake(cursorPoint.x, cursorPoint.y, 20, 20);    } else if (sender.state == UIGestureRecognizerStateChanged) {//        NSString *webString = [self.webView stringByEvaluatingJavaScriptFromString:@"document.body.innerText"];        CGRect newFrame = CGRectMake(self.lastRect0.origin.x + [sender translationInView:self.webView.keyboard].x - self.lastPoint.x, self.lastRect0.origin.y + [sender translationInView:self.webView.keyboard].y - self.lastPoint.y, self.lastRect0.size.width, self.lastRect0.size.height);        CGPoint cursorPoint;        if ([sender translationInView:self.webView.keyboard].y > 0) {            cursorPoint = CGPointMake(newFrame.origin.x, newFrame.origin.y);        } else if ([sender translationInView:self.webView.keyboard].y < 0) {            cursorPoint = CGPointMake(newFrame.origin.x, newFrame.origin.y + newFrame.size.height);        } else {            cursorPoint = CGPointMake(newFrame.origin.x, newFrame.origin.y + newFrame.size.height / 2);        }        UITextPosition *pos = [textInput closestPositionToPoint:cursorPoint];        UITextRange *textRange = [textInput textRangeFromPosition:pos toPosition:pos];        textInput.selectedTextRange = textRange;        self.lastRect0 = newFrame;        self.lastPoint = CGPointMake([sender translationInView:self.webView.keyboard].x, [sender translationInView:self.webView.keyboard].y);    }}static bool isReverse; //左右手指是否和locationOfTouch:检测结果相反//双指移动选择文字手势- (void)pinchSelect:(UIPinchGestureRecognizer *)sender {    UIResponder <UITextInput>*textInput = [UIResponder currentFirstResponder];    if (sender.state == UIGestureRecognizerStateBegan) {        self.startPoint0 = [sender locationOfTouch:0 inView:self.webView.keyboard];        self.startPoint1 = [sender locationOfTouch:1 inView:self.webView.keyboard];        isReverse = false;        if (self.startPoint0.x > self.startPoint1.x) {  //左右手指相反            CGPoint temp;            temp = self.startPoint0;            self.startPoint0 = self.startPoint1;            self.startPoint1 = temp;            isReverse = true;        }        if (textInput.selectedTextRange.isEmpty){   //是否有选区            self.startRect0 = [textInput caretRectForPosition:textInput.selectedTextRange.start];            self.startRect1 = [textInput caretRectForPosition:textInput.selectedTextRange.start];        } else {            self.startRect0 = [textInput caretRectForPosition:textInput.selectedTextRange.start];            self.startRect1 = [textInput caretRectForPosition:textInput.selectedTextRange.end];        }        self.lastRect0 = self.startRect0;        self.lastRect1 = self.startRect1;    } else if (sender.state == UIGestureRecognizerStateChanged) {        if ([sender numberOfTouches] == 2) {            float deltaX;            float deltaY;            //左边手指移动距离            if (isReverse) {                deltaX = [sender locationOfTouch:1 inView:self.webView.keyboard].x - self.startPoint0.x;                deltaY = [sender locationOfTouch:1 inView:self.webView.keyboard].y - self.startPoint0.y;            } else {                deltaX = [sender locationOfTouch:0 inView:self.webView.keyboard].x - self.startPoint0.x;                deltaY = [sender locationOfTouch:0 inView:self.webView.keyboard].y - self.startPoint0.y;            }            self.lastRect0 = CGRectMake(self.startRect0.origin.x, self.startRect0.origin.y, self.startRect0.size.width, self.startRect0.size.height);            if (deltaY > 0) {                self.lastRect0 = [self frame:_lastRect0 withPoint:CGPointMake(self.lastRect0.origin.x + deltaX, self.lastRect0.origin.y + deltaY)];//CGRectMake(self.lastRect0.origin.x + deltaX, self.lastRect0.origin.y + deltaY, 20, 20);            } else if (deltaY < 0) {                self.lastRect0 = [self frame:_lastRect0 withPoint:CGPointMake(self.lastRect0.origin.x + deltaX, self.lastRect0.origin.y + deltaY + self.lastRect0.size.height * 0.9)];            } else {                self.lastRect0 = [self frame:_lastRect0 withPoint:CGPointMake(self.lastRect0.origin.x + deltaX, self.lastRect0.origin.y + deltaY + self.lastRect0.size.height * 0.5)];            }            //右边手指移动            if (isReverse) {                deltaX = [sender locationOfTouch:0 inView:self.webView.keyboard].x - self.startPoint1.x;                deltaY = [sender locationOfTouch:0 inView:self.webView.keyboard].y - self.startPoint1.y;            } else {                deltaX = [sender locationOfTouch:1 inView:self.webView.keyboard].x - self.startPoint1.x;                deltaY = [sender locationOfTouch:1 inView:self.webView.keyboard].y - self.startPoint1.y;            }            self.lastRect1 = [self frame:_lastRect1 withPoint:CGPointMake(self.startRect1.origin.x, self.startRect1.origin.y)];            if (deltaY > 0) {                self.lastRect1 = [self frame:_lastRect1 withPoint:CGPointMake(self.lastRect1.origin.x + deltaX, self.lastRect1.origin.y + deltaY)];;            } else if (deltaY < 0) {                self.lastRect1 = [self frame:_lastRect1 withPoint:CGPointMake(self.lastRect1.origin.x + deltaX, self.lastRect1.origin.y + deltaY + self.lastRect1.size.height * 0.9)];;            } else {                self.lastRect1 = [self frame:_lastRect1 withPoint:CGPointMake(self.lastRect1.origin.x + deltaX, self.lastRect1.origin.y + deltaY + self.lastRect1.size.height * 0.5)];;            }            UITextPosition *textPoint0 = [textInput closestPositionToPoint:self.lastRect0.origin];            UITextPosition *textPoint1 = [textInput closestPositionToPoint:self.lastRect1.origin];            textInput.selectedTextRange = [textInput textRangeFromPosition:textPoint0 toPosition:textPoint1];        }    }}
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