NSDate *date= [NSDatedate];//當前時間
NSDate *lastDay = [NSDate dateWithTimeInterval:-24*60*60 sinceDate:date];//前一天
NSDate *nextDay = [NSDate dateWithTimeInterval:24*60*60 sinceDate:date];//后一天
datePicker.minimumDate = nextDay;//設置時間控制器的最小時間
NSDate *date= [NSDatedate];//當前時間
NSDate *lastDay = [NSDate dateWithTimeInterval:-24*60*60 sinceDate:date];//前一天
NSDate *nextDay = [NSDate dateWithTimeInterval:24*60*60 sinceDate:date];//后一天
datePicker.minimumDate = nextDay;//設置時間控制器的最小時間