thmodel_ios_model/model/Classes/Controllers/Controller/ShareVC/ShareViewController.m

//
//  ShareViewController.m
//  千模
//
//  Created by Drew on 2018/10/25.
//  Copyright © 2018 MUMEI. All rights reserved.
//

#import "ShareViewController.h"
#import "SharePopViewController.h"

@interface ShareViewController ()
@property (weak, nonatomic) IBOutlet UIView *qrcodeContainer;

@end

@implementation ShareViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(0, 0, 40, 40);
    UIImage *image = [[UIImage imageNamed:@"backBtn"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
    [btn setImage:image forState:UIControlStateNormal];
    btn.imageEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);
    btn.tintColor = [UIColor whiteColor];
    [btn addTarget:self action:@selector(backClick) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:btn];
    UIBarButtonItem *nagetiveSpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    nagetiveSpacer.width = -12;//这个值可以根据自己需要自己调整
    self.navigationItem.leftBarButtonItems = @[nagetiveSpacer, leftItem];
}

- (void)viewDidLayoutSubviews {
    [super viewWillLayoutSubviews];
    
    // gradient
    CAGradientLayer *gl = [CAGradientLayer layer];
    gl.frame = self.view.bounds;
    gl.startPoint = CGPointMake(0.5, 0);
    gl.endPoint = CGPointMake(0.5, 1);
    gl.colors = @[(__bridge id) [UIColor colorWithRed:251 / 255.0 green:92 / 255.0 blue:163 / 255.0 alpha:1].CGColor, (__bridge id) [UIColor colorWithRed:253 / 255.0 green:127 / 255.0 blue:141 / 255.0 alpha:1].CGColor];
    gl.locations = @[@(0), @(1.0f)];
    [self.view.layer insertSublayer:gl atIndex:0];

    self.qrcodeContainer.layer.cornerRadius = 12;
    
    UIImageView *qrcode = [[UIImageView alloc] initWithFrame:CGRectMake(7, 7, self.qrcodeContainer.frame.size.width - 14, self.qrcodeContainer.frame.size.width - 14)];
    qrcode.image = [self generateQRCod:shareUrl(@(self.type), [[NSUserDefaults standardUserDefaults] objectForKey:@"qrcode"]) withSize:qrcode.frame.size.width];
    [self.qrcodeContainer addSubview:qrcode];
}

- (UIImage*)generateQRCod:(NSString*) content withSize:(CGFloat)size {
    // 1.创建过滤器，这里的@"CIQRCodeGenerator"是固定的
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    
    // 2.恢复默认设置
    [filter setDefaults];
    
    // 3. 给过滤器添加数据
    NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding];
    // 注意，这里的value必须是NSData类型
    [filter setValue:data forKeyPath:@"inputMessage"];
    
    // 4. 生成二维码
    CIImage *image = [filter outputImage];
    
    
    CGRect extent = CGRectIntegral(image.extent);
    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
    
    // 1. 创建bitmap
    size_t width = CGRectGetWidth(extent) * scale;
    size_t height = CGRectGetHeight(extent) * scale;
    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
    CIContext *context = [CIContext contextWithOptions:nil];
    CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
    CGContextScaleCTM(bitmapRef, scale, scale);
    CGContextDrawImage(bitmapRef, extent, bitmapImage);
    
    // 2.保存bitmap图片
    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
    CGContextRelease(bitmapRef);
    CGImageRelease(bitmapImage);
    return [UIImage imageWithCGImage:scaledImage];
}

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
    [self.navigationController.navigationBar setShadowImage:[UIImage new]];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self.navigationController.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
    [self.navigationController.navigationBar setShadowImage:nil];
    self.navigationController.navigationBar.barStyle = UIBarStyleDefault;
}

- (void)backClick {
    [self.navigationController popViewControllerAnimated:YES];
}

- (IBAction)share:(id)sender {
    SharePopViewController *shareVC = [[SharePopViewController alloc] init];
    shareVC.type = self.type;
    [self presentViewController:shareVC animated:NO completion:nil];
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end