如何编写代码对ios桌面进行录屏操作？

可以使用replaykit，但是只支持ios9以后的系统版本，具体示例代码如下：

#import "ViewController.h"
#import <ReplayKit/ReplayKit.h>

static NSString *StartRecord = @"开始";
static NSString *StopRecord = @"结束";

#if TARGET_IPHONE_SIMULATOR
#define SIMULATOR 1
#elif TARGET_OS_IPHONE
#define SIMULATOR 0
#endif

#define AnimationDuration (0.3)


@interface ViewController () <RPPreviewViewControllerDelegate>
{

}
@property (nonatomic, strong)UIButton *btnStart;
@property (nonatomic, strong)UIButton *btnStop;
@property (nonatomic, strong)NSTimer *progressTimer;
@property (nonatomic, strong)UIProgressView *progressView;
@property (nonatomic, strong)UIActivityIndicatorView *activity;
@property (nonatomic, strong)UIView *tipView;
@property (nonatomic, strong)UILabel *lbTip;
@property (nonatomic, strong)UILabel *lbTime;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

- (void)viewDidAppear:(BOOL)animated {
    BOOL isVersionOk = [self isSystemVersionOk];

    if (!isVersionOk) {
        NSLog(@"系统版本需要是iOS9.0及以上才支持ReplayKit");
        return;
    }
    if (SIMULATOR) {
        [self showSimulatorWarning];
        return;
    }

    UILabel *lb = nil;
    CGSize screenSize = [UIScreen mainScreen].bounds.size;


    //标题
    lb = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 140)];
    lb.font = [UIFont boldSystemFontOfSize:32];
    lb.backgroundColor = [UIColor clearColor];
    lb.textColor = [UIColor blackColor];
    lb.textAlignment = NSTextAlignmentCenter;
    lb.numberOfLines = 3;
    lb.text = @"苹果ReplayKit Demo";
    lb.center =  CGPointMake(screenSize.width/2, 80);
    [self.view addSubview:lb];

    //创建按钮
    UIButton *btn = [self createButtonWithTitle:StartRecord andCenter:CGPointMake(screenSize.width/2 - 100, 200)];
    [self.view addSubview:btn];
    self.btnStart = btn;

    btn = [self createButtonWithTitle:StopRecord andCenter:CGPointMake(screenSize.width/2 + 100, 200)];
    [self.view addSubview:btn];
    self.btnStop = btn;
    [self setButton:btn enabled:NO];

    //loading指示
    UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 280, 80)];
    [self.view addSubview:view];
    view.backgroundColor = [UIColor redColor];
    view.layer.cornerRadius = 8.0f;
    view.center = CGPointMake(screenSize.width/2, 300);
    activity.center = CGPointMake(30, view.frame.size.height/2);
    [view addSubview:activity];
    [activity startAnimating];
    self.activity = activity;
    lb = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 280, 80)];
    lb.font = [UIFont boldSystemFontOfSize:20];
    lb.backgroundColor = [UIColor clearColor];
    lb.textColor = [UIColor blackColor];
    lb.layer.cornerRadius = 4.0;
    lb.textAlignment = NSTextAlignmentCenter;
    [view addSubview:lb];
    self.lbTip = lb;
    self.tipView = view;
    [self hideTip];


    //显示时间（用于看录制结果时能知道时间）
    lb = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 40)];
    lb.font = [UIFont boldSystemFontOfSize:20];
    lb.backgroundColor = [UIColor redColor];
    lb.textColor = [UIColor blackColor];
    lb.layer.cornerRadius = 4.0;
    NSDateFormatter * dateFormat = [[NSDateFormatter alloc] init] ;
    [dateFormat setDateFormat: @"HH:mm:ss"];
    NSString *dateString = [dateFormat stringFromDate:[NSDate date]];
    lb.text =  dateString;
    lb.center = CGPointMake(screenSize.width/2, screenSize.height/2 + 100);
    lb.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:lb];
    self.lbTime = lb;

    //进度条 （显示动画，不然看不出画面的变化）
    UIProgressView *progress = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 0, screenSize.width*0.8, 10)];
    progress.center = CGPointMake(screenSize.width/2, screenSize.height/2 + 150);
    progress.progressViewStyle = UIProgressViewStyleDefault;
    progress.progress = 0.0;
    [self.view addSubview:progress];
    self.progressView = progress;

    //计时器
    //更新时间
    [NSTimer scheduledTimerWithTimeInterval:1.0f
                                     target:self
                                   selector:@selector(updateTimeString)
                                   userInfo:nil
                                    repeats:YES];
}

#pragma mark - UI控件
//显示 提示信息
- (void)showTipWithText:(NSString *)tip activity:(BOOL)activity{
    [self.activity startAnimating];
    self.lbTip.text = tip;
    self.tipView.hidden = NO;
    if (activity) {
        self.activity.hidden = NO;
        [self.activity startAnimating];
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