自己修改了一下第三方UUDatePicker_Block，添加了屏幕适配,并解决了崩溃的bug

使用如下- (void)myTap{        [myBackView removeFromSuperview];}- (void)tap{    [_textView resignFirstResponder];        if (myBackView) {        [myBackView removeFromSuperview];    }        myBackView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, screenWidth, screenHeight-64)];    myBackView.backgroundColor = [UIColor colorWithWhite:0 alpha:.2];    [self.view addSubview:myBackView];                UITapGestureRecognizer *myTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(myTap)];    [myBackView addGestureRecognizer:myTap];    dateTimePickerView    = [[UUDatePicker alloc]initWithframe:CGRectMake(0, screenHeight-64-200, screenWidth, 200)                             PickerStyle:UUDateStyle_YearMonthDayHourMinute                             didSelected:^(NSString *year,                                           NSString *month,                                           NSString *day,                                           NSString *hour,                                           NSString *minute,                                           NSString *weekDay) {                                 selectTimeStr = [NSString stringWithFormat:@"%@-%@-%@ %@:%@",year,month,day,hour,minute];                             }];    dateTimePickerView.minLimitDate = [[NSDate date]dateByAddingTimeInterval:0];//也可以自定义最小时间//    // HH是24进制，hh是12进制//    formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";//    // 返回的格林治时间//    NSDate *date2 = [formatter dateFromString:@"2017-2-23 12:14:56"];//    dateTimePickerView.minLimitDate = date2;    [myBackView addSubview:dateTimePickerView];        UIView *whiteV = [[UIView alloc]initWithFrame:CGRectMake(0, dateTimePickerView.top-30, screenWidth, 30)];    whiteV.backgroundColor = [UIColor whiteColor];    [myBackView addSubview:whiteV];        //    UIButton *cancleBtn = [[UIButton alloc]initWithFrame:CGRectMake(10, 5, 60,30)];    cancleBtn.titleLabel.font = [UIFont systemFontOfSize:14];    [cancleBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];    [cancleBtn setBackgroundColor:dark_green];    [cancleBtn setTitle:@"取消" forState:UIControlStateNormal];    [cancleBtn addTarget:self action:@selector(selectedButtons:) forControlEvents:UIControlEventTouchUpInside];    cancleBtn.tag = 100;    [self setRadios:YES View:cancleBtn];    [whiteV addSubview:cancleBtn];        //    UIButton *okBtn = [[UIButton alloc]initWithFrame:CGRectMake(screenWidth-70, 5, 60, 30)];    [okBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];    okBtn.titleLabel.font = [UIFont systemFontOfSize:14];    [okBtn setBackgroundColor:dark_green];    [okBtn setTitle:@"确定" forState:UIControlStateNormal];    [okBtn addTarget:self action:@selector(selectedButtons:) forControlEvents:UIControlEventTouchUpInside];    okBtn.tag = 101;    [self setRadios:YES View:okBtn];    [whiteV addSubview:okBtn];    }-(void)setRadios:(BOOL)bl View:(UIView *)vw{    if (bl) {        vw.layer.cornerRadius=4;        vw.layer.masksToBounds = YES;    }}- (void)selectedButtons:(UIButton *)btn{        if (btn.tag==100) {        [myBackView removeFromSuperview];    }        if (btn.tag==101) {        [myBackView removeFromSuperview];        _timelbl.text = selectTimeStr;    }}