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keyBoard/Class/Common/V/KBAlert.m
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224
keyBoard/Class/Common/V/KBAlert.m
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//
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// KBAlert.m
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// keyBoard
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//
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#import "KBAlert.h"
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#import <UIKit/UIKit.h>
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#import "UIViewController+Extension.h"
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@implementation KBAlert
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// 简单的串行展示队列，避免重复 present 引发的异常
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static NSMutableArray<dispatch_block_t> *sQueue;
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static BOOL sPresenting = NO;
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static __weak UIViewController *sDefaultPresenter = nil; // 可选外部指定的 presenter（弱引用）
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#pragma mark - Helpers
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+ (void)initialize {
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if (self == KBAlert.class) {
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sQueue = [NSMutableArray array];
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}
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}
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+ (void)onMain:(dispatch_block_t)blk {
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if (NSThread.isMainThread) { blk(); } else { dispatch_async(dispatch_get_main_queue(), blk); }
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}
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+ (UIViewController *)presentingVC {
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// 优先使用外部指定的 presenter；否则找顶层
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UIViewController *vc = sDefaultPresenter;
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if (!vc) {
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vc = [UIViewController kb_topMostViewController];
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}
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return vc;
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}
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+ (void)enqueuePresent:(dispatch_block_t)presenter {
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[self onMain:^{
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[sQueue addObject:[presenter copy]];
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if (!sPresenting) { [self _dequeueAndPresentNext]; }
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}];
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}
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+ (void)_dequeueAndPresentNext {
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if (sPresenting || sQueue.count == 0) { return; }
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sPresenting = YES;
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dispatch_block_t blk = sQueue.firstObject;
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[sQueue removeObjectAtIndex:0];
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blk();
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}
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// 在任意 action 执行后调用，标记结束并尝试继续队列
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+ (void)_markFinishedAndContinue {
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// 延迟到下一个 runloop 以确保系统完成 dismiss 流程
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dispatch_async(dispatch_get_main_queue(), ^{
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sPresenting = NO;
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[self _dequeueAndPresentNext];
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});
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}
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// iPad 的 ActionSheet 需要 popover 锚点；此处自动兜底
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+ (void)configurePopoverIfNeeded:(UIAlertController *)ac anchorView:(UIView *)anchorView inVC:(UIViewController *)vc {
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if (ac.preferredStyle != UIAlertControllerStyleActionSheet) { return; }
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UIPopoverPresentationController *pop = ac.popoverPresentationController;
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if (!pop) { return; }
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if (anchorView) {
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pop.sourceView = anchorView;
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pop.sourceRect = anchorView.bounds;
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} else if (vc.view) {
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pop.sourceView = vc.view;
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CGSize sz = vc.view.bounds.size;
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CGRect r = CGRectMake(MAX(0, sz.width * 0.5 - 1), MAX(0, sz.height * 0.5 - 1), 2, 2);
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pop.sourceRect = r; // 居中一个很小的矩形，视觉近似居中弹出
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pop.permittedArrowDirections = 0;
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}
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}
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#pragma mark - Public API
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+ (void)setDefaultPresenter:(UIViewController *)presenter { sDefaultPresenter = presenter; }
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+ (void)showTitle:(NSString *)title message:(NSString *)message {
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[self showTitle:title message:message button:nil completion:nil];
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}
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+ (void)showTitle:(NSString *)title
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message:(NSString *)message
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button:(NSString *)button
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completion:(dispatch_block_t)completion {
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[self enqueuePresent:^{
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UIViewController *vc = [self presentingVC];
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if (!vc) { // 无法获取 presenter，直接结束队列
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[self _markFinishedAndContinue];
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return;
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}
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NSString *ok = button ?: (NSLocalizedString(@"OK", nil).length ? NSLocalizedString(@"OK", nil) : @"好");
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UIAlertController *ac = [UIAlertController alertControllerWithTitle:(title ?: @"")
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message:(message ?: @"")
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preferredStyle:UIAlertControllerStyleAlert];
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__weak UIAlertController *wac = ac;
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UIAlertAction *okAct = [UIAlertAction actionWithTitle:ok style:UIAlertActionStyleDefault handler:^(__unused UIAlertAction * _Nonnull action) {
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if (completion) { completion(); }
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// 防止异常：确保 alert 被关闭
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[wac dismissViewControllerAnimated:YES completion:nil];
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[KBAlert _markFinishedAndContinue];
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}];
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[ac addAction:okAct];
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[vc presentViewController:ac animated:YES completion:nil];
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}];
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}
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+ (void)confirmTitle:(NSString *)title message:(NSString *)message completion:(KBAlertBoolHandler)completion {
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[self confirmTitle:title message:message ok:nil cancel:nil completion:completion];
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}
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+ (void)confirmTitle:(NSString *)title
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message:(NSString *)message
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ok:(NSString *)okTitle
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cancel:(NSString *)cancelTitle
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completion:(KBAlertBoolHandler)completion {
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[self enqueuePresent:^{
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UIViewController *vc = [self presentingVC];
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if (!vc) { [self _markFinishedAndContinue]; return; }
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NSString *ok = okTitle ?: @"确定";
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NSString *cancel = cancelTitle ?: @"取消";
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UIAlertController *ac = [UIAlertController alertControllerWithTitle:(title ?: @"")
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message:(message ?: @"")
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preferredStyle:UIAlertControllerStyleAlert];
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__weak UIAlertController *wac = ac;
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UIAlertAction *cancelAct = [UIAlertAction actionWithTitle:cancel style:UIAlertActionStyleCancel handler:^(__unused UIAlertAction * _Nonnull a) {
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if (completion) { completion(NO); }
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[wac dismissViewControllerAnimated:YES completion:nil];
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[KBAlert _markFinishedAndContinue];
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}];
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UIAlertAction *okAct = [UIAlertAction actionWithTitle:ok style:UIAlertActionStyleDefault handler:^(__unused UIAlertAction * _Nonnull a) {
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if (completion) { completion(YES); }
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[wac dismissViewControllerAnimated:YES completion:nil];
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[KBAlert _markFinishedAndContinue];
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}];
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[ac addAction:cancelAct];
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[ac addAction:okAct];
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[vc presentViewController:ac animated:YES completion:nil];
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}];
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}
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+ (void)promptTitle:(NSString *)title
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message:(NSString *)message
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placeholder:(NSString *)placeholder
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ok:(NSString *)okTitle
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cancel:(NSString *)cancelTitle
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keyboardType:(UIKeyboardType)type
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configuration:(void (^)(UITextField * _Nonnull))config
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completion:(KBAlertTextHandler)completion {
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[self enqueuePresent:^{
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UIViewController *vc = [self presentingVC];
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if (!vc) { [self _markFinishedAndContinue]; return; }
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NSString *ok = okTitle ?: @"确定";
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NSString *cancel = cancelTitle ?: @"取消";
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UIAlertController *ac = [UIAlertController alertControllerWithTitle:(title ?: @"")
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message:(message ?: @"")
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preferredStyle:UIAlertControllerStyleAlert];
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__weak UIAlertController *wac = ac;
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[ac addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull tf) {
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tf.placeholder = placeholder;
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tf.keyboardType = type;
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if (config) { config(tf); }
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}];
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UIAlertAction *cancelAct = [UIAlertAction actionWithTitle:cancel style:UIAlertActionStyleCancel handler:^(__unused UIAlertAction * _Nonnull a) {
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if (completion) { completion(nil, NO); }
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[wac dismissViewControllerAnimated:YES completion:nil];
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[KBAlert _markFinishedAndContinue];
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}];
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UIAlertAction *okAct = [UIAlertAction actionWithTitle:ok style:UIAlertActionStyleDefault handler:^(__unused UIAlertAction * _Nonnull a) {
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NSString *text = wac.textFields.firstObject.text;
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if (completion) { completion(text, YES); }
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[wac dismissViewControllerAnimated:YES completion:nil];
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[KBAlert _markFinishedAndContinue];
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}];
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[ac addAction:cancelAct];
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[ac addAction:okAct];
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[vc presentViewController:ac animated:YES completion:nil];
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}];
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}
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+ (void)actionSheetTitle:(NSString *)title
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message:(NSString *)message
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actions:(NSArray<NSString *> *)actions
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cancel:(NSString *)cancelTitle
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destructiveIndex:(NSInteger)destructiveIndex
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fromView:(UIView *)anchorView
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completion:(KBAlertIndexHandler)completion {
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[self enqueuePresent:^{
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UIViewController *vc = [self presentingVC];
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if (!vc) { [self _markFinishedAndContinue]; return; }
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UIAlertController *ac = [UIAlertController alertControllerWithTitle:(title ?: @"")
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message:(message ?: @"")
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preferredStyle:UIAlertControllerStyleActionSheet];
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__weak UIAlertController *wac = ac;
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[actions enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
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UIAlertActionStyle style = (destructiveIndex >= 0 && (NSInteger)idx == destructiveIndex) ? UIAlertActionStyleDestructive : UIAlertActionStyleDefault;
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UIAlertAction *act = [UIAlertAction actionWithTitle:obj ?: @"" style:style handler:^(__unused UIAlertAction * _Nonnull a) {
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if (completion) { completion((NSInteger)idx); }
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[wac dismissViewControllerAnimated:YES completion:nil];
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[KBAlert _markFinishedAndContinue];
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}];
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[ac addAction:act];
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}];
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if (cancelTitle.length) {
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UIAlertAction *cancel = [UIAlertAction actionWithTitle:cancelTitle style:UIAlertActionStyleCancel handler:^(__unused UIAlertAction * _Nonnull a) {
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if (completion) { completion(-1); }
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[wac dismissViewControllerAnimated:YES completion:nil];
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[KBAlert _markFinishedAndContinue];
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}];
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[ac addAction:cancel];
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}
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[self configurePopoverIfNeeded:ac anchorView:anchorView inVC:vc];
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[vc presentViewController:ac animated:YES completion:nil];
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}];
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}
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@end
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