hanfengs

- (void)QRCodeScanVC:(UIViewController *)scanVC {
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if (device) {
        AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
        switch (status) {
            case AVAuthorizationStatusNotDetermined: {
                [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
                    if (granted) {
                        dispatch_sync(dispatch_get_main_queue(), ^{
                            [self.navigationController pushViewController:scanVC animated:YES];

hanfengs

NSDate *nowDate = [NSDate date];
NSUserDefaults *dataUser = [NSUserDefaults standardUserDefaults];
[dataUser setObject:nowDate forKey:@"nowDate"];
[dataUser synchronize];

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
NSDate *now = [NSDate date];
NSDate *agoDate = [userDefault objectForKey:@"nowDate"];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

hanfengs

Tips

做记录

方便管理

强调部分

hanfengs

//https://www.cnblogs.com/syios/p/7692566.html
//https://www.jianshu.com/p/35219655d187

-(BOOL)application:(UIApplication *)application shouldAllowExtensionPointIdentifier:(UIApplicationExtensionPointIdentifier)extensionPointIdentifier{
    
    // 整个app应用内禁用第三方键盘
//    if ([extensionPointIdentifier isEqualToString:@"com.apple.keyboard-service"]) {
//        return NO;
//    }

hanfengs

    NSArray *familyNames = [UIFont familyNames];

    for(NSString *familyName in familyNames ){

        printf("Family: %s \n", [familyName UTF8String]);

        NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];

        for(NSString *fontName in fontNames) {

hanfengs

//第一个参数 observer：观察者 （这里观察self.myKVO对象的属性变化）
//第二个参数 keyPath： 被观察的属性名称(这里观察 self.myKVO 中 num 属性值的改变)
//第三个参数 options： 观察属性的新值、旧值等的一些配置（枚举值，可以根据需要设置，例如这里可以使用两项）
//第四个参数 context： 上下文，可以为 KVO 的回调方法传值（例如设定为一个放置数据的字典）
[self.myKVO addObserver:self
             forKeyPath:@"num"
                options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew
                context:nil];
                

hanfengs

//GIF 的播放次数是 GIF 图片本身的属性，这应该是只读的。想要控制循环次数，大概有几种方法：

//1.如果你不能控制 GIF 图片内容，那你可以监听 YYAnimatedImageView 的 currentAnimatedImageIndex 属性，当播放到最后一帧时，调用 stopAnimating 停止动画。
//2.子类化 YYImage，把循环次数这个属性暴露出来：ibireme/YYImage#1
//3.用比较 hack 的方法来做：

if ([image isKindOfClass:[YYImage class]]) {
    YYImageDecoder *decoder = [image valueForKey:@"_decoder"];

hanfengs

- (void)line{
    
    UIImageView *iView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 200, 20)];
    [self.view addSubview:iView];
    
    UIGraphicsBeginImageContext(iView.frame.size); //参数size为新创建的位图上下文的大小
    [iView.image drawInRect:CGRectMake(0, 0, iView.frame.size.width, iView.frame.size.height)];
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapSquare); //设置线段收尾样式
    
    CGFloat length[] = {2,1}; // 线的宽度，间隔宽度

hanfengs

    
@interface TSUserLearnFlowInfo : NSObject<NSCoding>
@property (nonatomic, copy) NSString *homeworkId;
@property (nonatomic, copy) NSString *useTime;
@property (nonatomic, strong) NSArray *practiceIds;
@property (nonatomic, strong) NSArray *audioUrls;
@property (nonatomic, strong) NSArray *audioMarks;
@end
    
@implementation TSUserLearnFlowInfo

hanfengs

    
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
    NSString *filePath = [path stringByAppendingPathComponent:@"UserProgress.plist"];

    NSDictionary *dict = @{@"age" : @26,@"name" : @"LayneCheung"};
    [dict writeToFile:filePath atomically:YES];

    NSArray *dataArray = @[@56,@"asdfa"];
    [dataArray writeToFile:filePath atomically:YES];