ios15模仿Assistive Touch

Xnip2021-12-12_13-47-48.jpg

- (void)viewDidLoad {
    [super viewDidLoad];
    LJButton *btn = [[LJButton alloc] init];
    [btn setBackgroundImage:[UIImage imageNamed:@"Assistive Touch"] forState:UIControlStateNormal];
    btn.frame = CGRectMake(5, 100, 50, 50);
    btn.layer.cornerRadius = 5;
    btn.layer.masksToBounds = YES;
    [self.view addSubview:btn];
}
- (BOOL)prefersStatusBarHidden{
    return YES;
}

//
//  LJButton.m
//  Assistive Touch
//
//  Created by lujun on 2021/12/3.
//

#import "LJButton.h"
#define  PADDING 5
@interface LJButton()
{
  CGPoint   _beginPoint;
}
@end
@implementation LJButton
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [super touchesBegan:touches withEvent:event];
    UITouch *touch  = [touches anyObject];
    self->_beginPoint = [touch locationInView:self];
}
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [super touchesMoved:touches withEvent:event];
    UITouch *touch = [touches anyObject];
    CGPoint currentPoint = [touch locationInView:self];
    CGFloat x = currentPoint.x - _beginPoint.x;
    CGFloat y = currentPoint.y - _beginPoint.y;
    self.center = CGPointMake(self.center.x + x, self.center.y + y);
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [super touchesEnded:touches withEvent:event];
    CGFloat btnX = self.frame.origin.x;
    CGFloat btnY = self.frame.origin.y;
    CGFloat btnW = self.frame.size.width;
    CGFloat btnH = self.frame.size.height;
    CGFloat kScreenW = [UIScreen mainScreen].bounds.size.width;
    CGFloat kScreenH = [UIScreen mainScreen].bounds.size.height;
    CGFloat marginLeft = btnX;
    CGFloat marginRight = kScreenW - btnX - btnW;
    CGFloat marginTop = btnY;
    CGFloat marginBottom = kScreenH - btnY - btnH;
    [UIView animateWithDuration:0.2 animations:^{
        CGFloat btnNewX,btnNewY;
        if(marginTop < 60){
            if(marginLeft < marginRight){
                btnNewX = marginLeft < PADDING ? PADDING : btnX;
            }else {
                btnNewX = marginRight < PADDING ? (kScreenW - btnW - PADDING) : btnX;
            }
            btnNewY = PADDING;
            self.frame = CGRectMake(btnNewX, btnNewY, btnW, btnH);
        }
        else if (marginBottom < 60) {
            if(marginLeft < marginRight){
                btnNewX = marginLeft < PADDING ? PADDING : btnX;
            }else {
                btnNewX = marginRight < PADDING ? (kScreenW - btnW - PADDING) : btnX;
            }
            btnNewY = kScreenH - btnH - PADDING;
            self.frame = CGRectMake(btnNewX, btnNewY, btnW, btnH);
        }
        else {
            btnNewX = (marginLeft < marginRight) ? PADDING : (kScreenW - btnW - PADDING);
            btnNewY = btnY;
            self.frame = CGRectMake(btnNewX, btnNewY, btnW, btnH);
        }
     }];
}
@end