NS_AVAILABLE_IOS(9_0)
@interface VCVerifyCodeInputView : UIView

/// 验证码长度,默认`6`
@property (nonatomic, assign) NSInteger length;
/// 键盘类型,默认`UIKeyboardTypeNumberPad`
@property (nonatomic, assign) UIKeyboardType keyboardType;
/// 验证码输入完毕后的回调
@property (nonatomic, copy) void(^didInputCompletionHandler)(NSString *verifycode);
/// 文本框高亮颜色,默认(30,144,255)
@property (nonatomic, strong) UIColor *focusColor;

/// 获取用户输入的验证码
@property (nonatomic, copy, readonly) NSString *verifycode;

@end

@interface VCVerifyCodeInputView ()<UITextFieldDelegate>

@end

@implementation VCVerifyCodeInputView
{
    UIStackView *stackView;
    UITextField *textField;
}

#pragma mark - Lifecycle

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self setup];
    }
    return self;
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        [self setup];
    }
    return self;
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextFieldTextDidChangeNotification object:textField];
}

#pragma mark - <UITextFieldDelegate>

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    [self updateInputIndicator];
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
    for (UIView *view in stackView.arrangedSubviews) {
        view.layer.borderColor = [[UIColor blackColor] CGColor];
    }
    
    if (textField.text.length == self.length && self.didInputCompletionHandler) {
        self.didInputCompletionHandler(textField.text);
    }
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if (range.length == 0) { // Add.
        if (textField.text.length == self.length) {
            return NO;
        }
        NSString *regexp = @"^[A-Za-z0-9]{1}$";
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regexp];
        return [predicate evaluateWithObject:string];
    }
    return YES;
}

#pragma mark - Actions

- (void)textFieldTextDidChangeNotificationAction:(NSNotification *)sender {
    NSString *text = textField.text;
    [self updateInputIndicator];
    if (textField.isEditing && text.length == self.length) {
        // 收起键盘并回调block
        [textField resignFirstResponder];
    }
}

#pragma mark - Private

- (void)setup {
    stackView = [[UIStackView alloc] init];
    stackView.axis = UILayoutConstraintAxisHorizontal;
    stackView.distribution = UIStackViewDistributionFillEqually;
    stackView.spacing = 10.0;
    [self addSubviewToFill:stackView];
    
    textField = [[UITextField alloc] init];
    textField.borderStyle = UITextBorderStyleNone;
    textField.backgroundColor = [UIColor clearColor];
    textField.keyboardType = UIKeyboardTypeNumberPad;
    textField.autocorrectionType = UITextAutocorrectionTypeNo; // 禁用自动联想功能
    textField.tintColor = [UIColor clearColor]; // 清除光标颜色
    textField.textColor = [UIColor clearColor]; // 清除文字颜色
    textField.delegate = self;
    [self addSubviewToFill:textField];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldTextDidChangeNotificationAction:) name:UITextFieldTextDidChangeNotification object:textField];
    
    [self setLength:6];
    self.focusColor = [UIColor colorWithRed:30/255.0 green:144/255.0 blue:255/255.0 alpha:1.0];
}

/// 更新输入指示器状态
- (void)updateInputIndicator {
    NSString *text = textField.text;
    for (NSInteger idx=0; idx<self.length; idx++) {
        UILabel *label = (UILabel *)stackView.arrangedSubviews[idx];
        if (text.length && idx < text.length) {
            label.text = [NSString stringWithFormat:@"%C", [text characterAtIndex:idx]];
        } else {
            label.text = nil;
        }
        if (idx == text.length) {
            label.layer.borderColor = [self.focusColor CGColor];
        } else {
            label.layer.borderColor = [UIColor blackColor].CGColor;
        }
    }
}

- (void)addSubviewToFill:(UIView *)subview {
    [self addSubview:subview];
    subview.translatesAutoresizingMaskIntoConstraints = NO;
    [subview.topAnchor constraintEqualToAnchor:self.topAnchor].active = YES;
    [subview.bottomAnchor constraintEqualToAnchor:self.bottomAnchor].active = YES;
    [subview.leadingAnchor constraintEqualToAnchor:self.leadingAnchor].active = YES;
    [subview.trailingAnchor constraintEqualToAnchor:self.trailingAnchor].active = YES;
}

#pragma mark - setter & getter

- (void)setLength:(NSInteger)length {
    [stackView.arrangedSubviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
    for (NSInteger idx=0; idx<length; idx++) {
        UILabel *label = [[UILabel alloc] init];
        label.textAlignment = NSTextAlignmentCenter;
        label.backgroundColor = [UIColor clearColor];
        label.layer.borderWidth = 1.0;
        label.layer.borderColor = [[UIColor blackColor] CGColor];
        label.layer.cornerRadius = 5.0;
        label.layer.masksToBounds = YES;
        [stackView addArrangedSubview:label];
    }
}

- (NSInteger)length {
    return stackView.arrangedSubviews.count;
}

- (void)setKeyboardType:(UIKeyboardType)keyboardType {
    textField.keyboardType = keyboardType;
}

- (UIKeyboardType)keyboardType {
    return textField.keyboardType;
}

- (NSString *)verifycode {
    return textField.text;
}

@end

VCVerifyCodeInputView *verifyCodeView = [[VCVerifyCodeInputView alloc] init];
verifyCodeView.frame = CGRectMake(20.0, 100.0, 340.0, 40.0);
verifyCodeView.length = 8;
verifyCodeView.focusColor = [UIColor redColor];
[verifyCodeView setDidInputCompletionHandler:^(NSString *verifycode) {
    NSLog(@"输入的验证码是: %@", verifycode);
}];
[self.view addSubview:verifyCodeView];

UITextField* UISearchBar_searchTextField(id self, SEL _cmd)
{
    if (@available(iOS 13.0, *)) {
        return [(UISearchBar *)self searchTextField];
    }
    return [self valueForKey:@"_searchField"];
}

@implementation UISearchBar (iOS13)

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        if (@available(iOS 13.0, *)) {
            // do nothing.
        } else {
            // 动态添加 `-searchTextField` 方法, 兼容iOS13以下版本
            class_addMethod(self, @selector(searchTextField), (IMP)UISearchBar_searchTextField, "@@:");
        }
    });
}

@end

- (void)setNavigationBarBackgroundAlpha:(CGFloat)alpha {
    UIView *barBackgroundView = self.navigationBar.subviews.firstObject;
    if (@available(iOS 13.0, *)) {
        barBackgroundView.alpha = alpha;
        return;
    }
    // 处理底部分割线
    UIView *shadowView = [barBackgroundView valueForKey:@"_shadowView"];
    shadowView.hidden = (alpha < 1.0);
    // 处理背景
    if (self.navigationBar.isTranslucent) {
        if (@available(iOS 10.0, *)) {
            UIView *backgroundEffectView = [barBackgroundView valueForKey:@"_backgroundEffectView"];
            backgroundEffectView.alpha = alpha;
        } else {
            UIView *adaptiveBackdrop = [barBackgroundView valueForKey:@"_adaptiveBackdrop"];
            adaptiveBackdrop.alpha = alpha;
        }
    } else {
        barBackgroundView.alpha = alpha;
    }
}

#import <objc/runtime.h>

@interface UIViewController (iOS13ResetModalStyle)

@end

@implementation UIViewController (iOS13ResetModalStyle)

static const char kIsSetedModalPresentationStyleKey = '\0';
 
+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        if (@available(iOS 13.0, *)) {
            NSArray *sels = @[
                NSStringFromSelector(@selector(setModalPresentationStyle:)),
                NSStringFromSelector(@selector(presentViewController:animated:completion:)),
            ];
            for (NSString *name in sels) {
                Method originalMethod = class_getInstanceMethod(self, NSSelectorFromString(name));
                Method swizlledMethod = class_getInstanceMethod(self, NSSelectorFromString([@"xp_" stringByAppendingString:name]));
                method_exchangeImplementations(originalMethod, swizlledMethod);
            }
        }
    });
}

- (void)xp_setModalPresentationStyle:(UIModalPresentationStyle)modalPresentationStyle {
    objc_setAssociatedObject(self, &kIsSetedModalPresentationStyleKey, @(YES), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    [self xp_setModalPresentationStyle:modalPresentationStyle];
}

- (void)xp_presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion {
    if (@available(iOS 13.0, *)) {
        switch (viewControllerToPresent.modalPresentationStyle) {
            case UIModalPresentationPageSheet:
            case UIModalPresentationNone:
            case UIModalPresentationAutomatic:
            {
                BOOL isSetedModalPresentationStyle = [objc_getAssociatedObject(viewControllerToPresent, &kIsSetedModalPresentationStyleKey) boolValue];
                if (!isSetedModalPresentationStyle) {
                    viewControllerToPresent.modalPresentationStyle = UIModalPresentationFullScreen;
                }
            }
                break;
            default:
                break;
        }
    }
    [self xp_presentViewController:viewControllerToPresent animated:flag completion:completion];
}

@end

@implementation UINavigationController

+ (void)initialize {
    UIImage *backImage = [[UIImage imageNamed:@"icon-back"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    UINavigationBar *navigationBar = [UINavigationBar appearance];
    navigationBar.translucent = YES;
    navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor]};
    navigationBar.backIndicatorImage = backImage;
    navigationBar.backIndicatorTransitionMaskImage = backImage;
    
    NSDictionary *attributes = @{
                                 NSFontAttributeName: [UIFont systemFontOfSize:15.0],
                                 NSForegroundColorAttributeName: [UIColor whiteColor]
                                 };
    UIBarButtonItem *barButtonItem = [UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UINavigationBar class]]];
    [barButtonItem setTitleTextAttributes:attributes forState:UIControlStateNormal];
    [barButtonItem setTitleTextAttributes:attributes forState:UIControlStateHighlighted];
}

@end

/*
 Fallback Behavior:
 1) Appearance objects are used in whole – that is, all values will be sourced entirely from an instance of UINavigationBarAppearance defined by one of these named properties (standardAppearance, compactAppearance, scrollEdgeAppearance) on either UINavigationBar (self) or UINavigationItem (self.topItem).
 2) The navigation bar will always attempt to use the most relevant appearance instances first, before falling back to less relevant ones. The fallback logic is:
     AtScrollEdge: self.topItem.scrollEdgeAppearance => self.scrollEdgeAppearance => self.topItem.standardAppearance => self.standardAppearance
     CompactSize: self.topItem.compactAppearance => self.compactAppearance => self.topItem.standardAppearance => self.standardAppearance
     NormalSize: self.topItem.standardAppearance => self.standardAppearance
 */

/// Describes the appearance attributes for the navigation bar to use when it is displayed with its standard height.
@property (nonatomic, readwrite, copy) UINavigationBarAppearance *standardAppearance UI_APPEARANCE_SELECTOR API_AVAILABLE(ios(13.0), tvos(13.0));
/// Describes the appearance attributes for the navigation bar to use when it is displayed with its compact height. If not set, the standardAppearance will be used instead.
@property (nonatomic, readwrite, copy, nullable) UINavigationBarAppearance *compactAppearance UI_APPEARANCE_SELECTOR API_AVAILABLE(ios(13.0));
/// Describes the appearance attributes for the navigation bar to use when an associated UIScrollView has reached the edge abutting the bar (the top edge for the navigation bar). If not set, a modified standardAppearance will be used instead.
@property (nonatomic, readwrite, copy, nullable) UINavigationBarAppearance *scrollEdgeAppearance UI_APPEARANCE_SELECTOR API_AVAILABLE(ios(13.0));

@implementation UINavigationBar

+ (void)initialize {
    if (@available(iOS 13.0, *)) {
        UINavigationBarAppearance *standardAppearance = [[UINavigationBarAppearance alloc] init];
        standardAppearance.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor redColor]};
        standardAppearance.backgroundColor = [UIColor orangeColor];
        // 设置返回按钮(可以通过standardAppearance.backButtonAppearance进一步定制)
        UIImage *backImage = [[UIImage imageNamed:@"icon-back"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        [standardAppearance setBackIndicatorImage:backImage transitionMaskImage:backImage];
        // 设置UIBarButtonItem样式
        NSDictionary *attributes = @{
            NSFontAttributeName: [UIFont systemFontOfSize:15.0],
            NSForegroundColorAttributeName: [UIColor whiteColor]
        };
        UIBarButtonItemAppearance *buttonAppearance = standardAppearance.buttonAppearance;
        buttonAppearance.normal.titleTextAttributes = attributes;
        buttonAppearance.highlighted.titleTextAttributes = attributes;
        // 记得覆盖原来的样式
        [[UINavigationBar appearance] setStandardAppearance:standardAppearance];
    } else {
        // 之前的做法
    }
}

@end

(function(exports) {
	AppId = NSBundle.mainBundle.bundleIdentifier;

	RootVC = function() {
		return [UIApplication sharedApplication].keyWindow.rootViewController;
	};

	exports.nothing = function() {};

	// ...
})(exports);