IOS 截屏單例代碼

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一.  IOS 的截取全屏代碼為：
  

    UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];    //1.截屏    UIGraphicsBeginImageContext(screenWindow.frame.size);    [screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];    UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();

二. 截取指定地區：
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,self.view.opaque,0.0);
[self.myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage*theImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

NSData*theImageData=UIImageJPEGRepresentation(theImage,1.0 );//you can use PNG too
[theImageData writeToFile:@"example.jpeg" atomically:YES];


三.截屏代碼的單例
ScreenShot.h檔案

#import <Foundation/Foundation.h>@interface ScreenShot : NSObject///截屏圖片存放位置@property (nonatomic,copy) NSString *filePath;/* 單例函數 */+ (id)sharedScreenShot;/* 截屏，並寫入記憶體 */-(void)getScreenImage;@end

ScreenShot.m檔案

#import "ScreenShot.h"///截屏圖片#define ScreenShotImage @"screenshot.png"@implementation ScreenShot@synthesize filePath=_filePath;- (id)init {    if (self = [super init]) {        _filePath=[self documentsPathForFileName:ScreenShotImage];    }    return self;}#pragma mark -單例+ (id)sharedScreenShot {    static ScreenShot *screenShot = nil;    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        screenShot = [[self alloc] init];    });    return screenShot;}#pragma mark 通過檔案名稱獲得路徑- (NSString *)documentsPathForFileName:(NSString *)name{    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);    NSString *documentsPath = [paths objectAtIndex:0];        return [documentsPath stringByAppendingPathComponent:name];}#pragma mark - 截屏-(void)getScreenImage{    UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];    //1.截屏    UIGraphicsBeginImageContext(screenWindow.frame.size);    [screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];    UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    //2.儲存    NSData *screenshotPNG = UIImagePNGRepresentation(screenshot);        NSError *error = nil;    //3.寫入記憶體    [screenshotPNG writeToFile:_filePath options:NSAtomicWrite error:&error];}@end

四.使用： 
1.在ViewController中引入標頭檔ScreenShot.h

    //截屏並儲存   [ScreenShot sharedScreenShot] getScreenImage];

2. 獲得圖片

    NSString *shotFilePath=((ScreenShot *)[ScreenShot sharedScreenShot]).filePath;    NSData *shotImageData = [NSData dataWithContentsOfFile:shotFilePath];    UIImage *shotImage = [UIImage imageWithData:shotImageData];