ios开发中获得的日期不对

我已经试了很多方法，但是获得的日期都不是当期日期。这是现在的代码：

NSDateFormatter *tempFormatter = [[NSDateFormatter alloc]init];
[tempFormatter setDateFormat:@"dd-MM-yyy"];

NSDate *currentDate = [NSDate date];
NSDate *fromDate = [NSString stringWithFormat:@"%@",[tempFormatter stringFromDate:currentDate]];
NSLog(@"currentDate %@", fromDate);

NSDate *toDate = [NSString stringWithFormat:@"%@",[tempFormatter stringFromDate:datePicker.date]];
NSLog(@"toDate %@", toDate);

NSTimeInterval interval = [toDate timeIntervalSinceDate:fromDate];
double leftDays = interval/86400;
NSLog(@"Total interval Between::%g",leftDays);

不知道错误在哪儿了，谢谢帮忙。

你的这行代码有问题：

 NSDate *toDate = [NSString stringWithFormat:@"%@",[tempFormatter stringFromDate:datePicker.date]];

你的代码中只有fromDate是NSDate类型

所以把你的代码改成这样：

NSDate *currentDate = [NSDate date];
    NSDate *toDate = datePicker.date;
NSTimeInterval interval = [toDate timeIntervalSinceDate:currentDate];

肯定会有用的