不兼容的指针类型将 NSString 发送到 NSDate* _Nonnull ios Objective c 类型的参数

Question

我有以下代码。这里我尝试了两种方法来获取日期和时间。如果我使用格式化程序，它会给我上述错误。如果我不使用它，日期格式不正确，加上我得到的时间也不正确。请帮忙。

NSDate *pickupHoursLate;
NSDate *dropHoursLate;

formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd-MM-yyyy HH:mm"];
NSLog(@"Old Date and Time : %@",[formatter stringFromDate:[NSDate date]]);

这给了我这样的输出 12-07-2016 18:32 这是我想要的

NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *components = [[NSDateComponents alloc] init];
    int pickHoursToAdd = [[[NSUserDefaults standardUserDefaults] objectForKey:@"pickupPriorTimePeriod"] intValue];
    [components setHour:pickHoursToAdd];
    pickupHoursLate = [calender dateByAddingComponents:components toDate:[formatter stringFromDate:[NSDate date]] options:0];    

这条线给了我错误

int dropHoursToAdd = [[[NSUserDefaults standardUserDefaults] objectForKey:@"dropPriorTimePeriod"] intValue];
[components setHour:dropHoursToAdd];
dropHoursLate = [calender dateByAddingComponents:components toDate:[NSDate date] options:0];   

在当前时间加上 2 小时后，这条线给我的值 2016-07-12 15:02:51 +0000 但这里的时间不正确

Answer 1

试试这个....

    NSDate *pickupHoursLate;
NSDate *dropHoursLate;

formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd-MM-yyyy HH:mm"];
[formatter setTimeZone:[NSTimeZone systemTimeZone]];
NSLog(@"Old Date and Time : %@",[formatter stringFromDate:[NSDate date]]); **<this give me output like this 12-07-2016 18:32 which I want>**
NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [[NSDateComponents alloc] init];
int pickHoursToAdd = [[[NSUserDefaults standardUserDefaults] objectForKey:@"pickupPriorTimePeriod"] intValue];
[components setHour:pickHoursToAdd];

//Editing start
NSString *dateStr = [formatter stringFromDate:[NSDate date]] ;
NSDate *date = [formatter dateFromString:dateStr];
    pickupHoursLate = [calender dateByAddingComponents:components toDate: date options:0];    **<This Line gives me the error>**
//Editing  End

int dropHoursToAdd = [[[NSUserDefaults standardUserDefaults] objectForKey:@"dropPriorTimePeriod"] intValue];
[components setHour:dropHoursToAdd];
dropHoursLate = [calender dateByAddingComponents:components toDate:[NSDate date] options:0];   **<This Line gives me the value "2016-07-12 15:02:51 +0000" after adding 2 hrs to current time but here the time is incorrect>**