iOS系統錄屏如何增加雷達波紋效果(從一個點向周圍擴散)的簡單實作

1.在mian.m中

UIApplicationMain的第三個參數改為MYApplication

int main(int argc, char * argv[]) {
    NSString * appDelegateClassName;
    @autoreleasepool {
        // Setup code that might create autoreleased objects goes here.
        appDelegateClassName = NSStringFromClass([AppDelegate class]);
    }
    return UIApplicationMain(argc, argv, @"MYApplication", appDelegateClassName);
}
           

2.建立MYApplication .h .m

//
//  MYApplication.h
//  kkkvo
//
//  Created by YYY on 2021/8/31.
//  Copyright © 2021 YYY. All rights reserved.
//

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface MYApplication : UIApplication

@end

NS_ASSUME_NONNULL_END
           

//
//  MYApplication.m
//  kkkvo
//
//  Created by YYY on 2021/8/31.
//  Copyright © 2021 YYY. All rights reserved.
//

#import "MYApplication.h"

@implementation MYApplication

- (void)sendEvent:(UIEvent *)event{
    [super sendEvent:event];
    
 
    UITouch *touch = [event.allTouches anyObject];
    CGPoint locationPointWindow = [touch preciseLocationInView:touch.window];
    
    UIView *centerRadarView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 7, 7)];
    centerRadarView.centerX = locationPointWindow.x;
    centerRadarView.centerY = locationPointWindow.y;
    centerRadarView.userInteractionEnabled = NO;
    centerRadarView.backgroundColor = [UIColor clearColor];
    centerRadarView.layer.borderColor = [UIColor blackColor].CGColor;
    centerRadarView.layer.borderWidth = 3.5;
    centerRadarView.layer.cornerRadius = 7/2.0;
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.0001 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        
        [touch.window addSubview:centerRadarView];
        
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.03 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [UIView animateWithDuration:0.4 animations:^{
                centerRadarView.width = 25;
                centerRadarView.height = 25;
                centerRadarView.layer.cornerRadius = 25/2.0;
                centerRadarView.centerX = locationPointWindow.x;
                centerRadarView.centerY = locationPointWindow.y;
                centerRadarView.layer.borderWidth = 2;

            } completion:^(BOOL finished) {
                [centerRadarView removeFromSuperview];

            }];
        });

    });

  
}

@end
           

3.原理是擷取坐标點，加載到window上顯示，通過圓角和寬高的線性動畫，實作類似一塊石頭扔到水裡的效果

4.當然可以隻在當錄屏情況下才添加這個效果，增過錄屏的通知方法來打開關閉這個功能。

demo  連結: https://pan.baidu.com/s/1dM8iWK2hU3SupEfngIrOpg 提取碼: kd8h 複制這段内容後打開百度網盤手機App，操作更友善哦

。