ios - 无法将字符串转换为仅限 iOS 13.3 的 NSDate

Question

我有一个包含日期和时间的字符串。尝试将字符串转换为 NSDate 时，它​​变为 nil 并且应用程序崩溃。它适用于其他 iOS 版本 13、13.1 和 13.2。它仅在 iOS 13.3 中崩溃。

代码片段:

NSString *startDateString = @"01-04-2020 8:00pm";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];  
dateFormatter.dateFormat = @"MM-dd-yyyy h:mma";  
NSDate *startDate = [dateFormatter dateFromString:startDateString]; 

在上面提到的代码中，当我调试 startDate 在 iOS 13.3 中为 nil 但它在较低的 iOS 版本中工作正常。

崩溃报告:

2020-01-06 10:04:28.312021+0530 LivingTree[1295:196522] *** Assertion failure in -[_UIDatePickerView _setDate:animated:forced:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKitCore/UIKit-3901.4.2/_UIDatePickerView.m:306
2020-01-06 10:04:28.313254+0530 LivingTree[1295:196522] CRASH: Invalid parameter not satisfying: date
2020-01-06 10:04:28.327693+0530 LivingTree[1295:196522] Stack Trace: (
    0   CoreFoundation                      0x0000000198bec980 93BD750D-2ECE-3E38-8405-9E46EFE482C6 + 1255808
    1   libobjc.A.dylib                     0x0000000198905028 objc_exception_throw + 60
    2   CoreFoundation                      0x0000000198ae94fc 93BD750D-2ECE-3E38-8405-9E46EFE482C6 + 193788
    3   Foundation                          0x0000000198f2a700 80C31587-F538-3437-966F-300F6632EB95 + 571136
    4   UIKitCore                           0x000000019cc5e634 AA897CA9-8D15-3DD7-BB4F-8D90F9A28571 + 10253876
    5   UIKitCore                           0x000000019cc5e310 AA897CA9-8D15-3DD7-BB4F-8D90F9A28571 + 10253072
    6   UIKitCore                           0x000000019cc4dd3c AA897CA9-8D15-3DD7-BB4F-8D90F9A28571 + 10186044
    7   LivingTree                          0x000000010018e930 -[CreateEventViewController setEditEventData] + 13568
    8   LivingTree                          0x000000010018b41c __40-[CreateEventViewController viewDidLoad]_block_invoke + 3344
    9   libdispatch.dylib                   0x0000000101ae1e1c _dispatch_call_block_and_release + 32
    10  libdispatch.dylib                   0x0000000101ae327c _dispatch_client_callout + 20
    11  libdispatch.dylib                   0x0000000101af132c _dispatch_main_queue_callback_4CF + 1376
    12  CoreFoundation                      0x0000000198b67cc8 93BD750D-2ECE-3E38-8405-9E46EFE482C6 + 711880
    13  CoreFoundation                      0x0000000198b62a24 93BD750D-2ECE-3E38-8405-9E46EFE482C6 + 690724
    14  CoreFoundation                      0x0000000198b61f40 CFRunLoopRunSpecific + 480
    15  GraphicsServices                    0x00000001a2ddf534 GSEventRunModal + 108
    16  UIKitCore                           0x000000019ccdaa60 UIApplicationMain + 1940
    17  LivingTree                          0x00000001001143f8 main + 124
    18  libdyld.dylib                       0x00000001989e0e18 9059087B-727B-3B45-B672-09E5B03E6020 + 3608
)
2020-01-06 10:04:28.328420+0530 LivingTree[1295:196522] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: date'
*** First throw call stack:
(0x198bec96c 0x198905028 0x198ae94fc 0x198f2a700 0x19cc5e634 0x19cc5e310 0x19cc4dd3c 0x10018e930 0x10018b41c 0x101ae1e1c 0x101ae327c 0x101af132c 0x198b67cc8 0x198b62a24 0x198b61f40 0x1a2ddf534 0x19ccdaa60 0x1001143f8 0x1989e0e18)
libc++abi.dylib: terminating with uncaught exception of type NSException

Answer 1

 NSString *startDateString = @"01-04-2020 8:00pm";
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"MM-dd-yyyy h:mma";
    dateFormatter.locale = [[NSLocale alloc]initWithLocaleIdentifier:@"en_US_POSIX"];
    dateFormatter.timeZone = [[NSTimeZone alloc]initWithName:@"UTC"];
    NSDate *startDate = [dateFormatter dateFromString:startDateString];