设置UIDatePicker的允许最大时间、最小时间：
self.frame = CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, [[UIScreen mainScreen] bounds].size.height);datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 44, CGRectGetWidth(self.frame), 216)];datePicker.datePickerMode = UIDatePickerModeDate;datePicker.locale = [NSLocale localeWithLocaleIdentifier:@"zh"];datePicker.backgroundColor = [UIColor whiteColor];self.frame = CGRe
