iOS 学习笔记一【屏幕截图，并显示当前View】

//

//  ViewController.h

//  屏幕截图测试

//

//  Created by 博爱之家 on 15/11/11.

//  Copyright © 2015年 博爱之家. All rights reserved.

//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

{

NSData *imageData;

}

@end

//

//  ViewController.m

//  屏幕截图测试

//

//  Created by 博爱之家 on 15/11/11.

//  Copyright © 2015年 博爱之家. All rights reserved.

//

#import "ViewController.h"

//宏定义

//当前设备的屏幕宽度

#define KSCREEN_WIDTH   [[UIScreen mainScreen] bounds].size.width

//当前设备的屏幕高度

#define KSCREEN_HEIGHT   [[UIScreen mainScreen] bounds].size.height

@interface ViewController ()

@property (nonatomic, strong) UILabel *testlabel;

@property (nonatomic, strong) UIButton *testButton;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

self.title = @"截屏测试";

self.view.backgroundColor = [UIColor whiteColor];

self.testlabel = [UILabel new];

self.testlabel.frame = CGRectMake((KSCREEN_WIDTH-200)/2 , 100, 200, 50);

self.testlabel.text = @"截屏测试";

self.testButton = [UIButton buttonWithType:UIButtonTypeCustom];

self.testButton.frame = CGRectMake((KSCREEN_WIDTH-200)/2 , 200, 200, 50);

[self.testButton setTitle:@"点击截屏" forState:UIControlStateNormal];

self.testButton.backgroundColor = [UIColor purpleColor];

[self.testButton addTarget:self action:@selector(clickBUutton:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:self.testlabel];

[self.view addSubview:self.testButton];

}

- (IBAction)clickBUutton:(id)sender

{

NSLog(@"开始");

[self saveScreenShotsView];

UIImageView *imageView = [[UIImageView alloc] init];

imageView.frame = CGRectMake(100, 400, 200, 200);

imageView.backgroundColor = [UIColor greenColor];

imageView.image = [UIImage imageWithData:imageData];

[self.view addSubview:imageView];

}

// 保存图片

- (void)saveScreenShotsView

{

UIImage *image = [self getNormalImage:self.view];

UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);

[self saveToDisk:image];

NSLog(@"结束");

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}

#pragma mark - 获取屏幕截图

- (UIImage *)getNormalImage:(UIView *)view

{

UIGraphicsBeginImageContext(CGSizeMake(KSCREEN_WIDTH, KSCREEN_HEIGHT));

CGContextRef context = UIGraphicsGetCurrentContext();

[view.layer renderInContext:context];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;

}

#pragma mark - 保存到硬盘中

- (void)saveToDisk:(UIImage *)image

{

NSString *dirPath = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSLog(@"保存路径： %@", dirPath);

NSString *path = [NSString stringWithFormat:@"%@/pic_%f.png",dirPath,[NSDate timeIntervalSinceReferenceDate]];

imageData = [NSData dataWithData:UIImagePNGRepresentation(image)];

[imageData writeToFile:path atomically:YES];

NSLog(@"保存路径： %@", path);

NSString *imagePath = [[path componentsSeparatedByString:@"/"] lastObject];

NSLog(@"保存路径2imagePath： %@", imagePath);

NSLog(@"保存完毕");

}

@end