UIPickerView

//固定的大小 320×216.

   self.genderTitleArray = @[@"神秘", @"女性", @"男性"];
    self.gendervalueArray = @[@"UNKNOW", @"FEMALE", @"MALE"];
    UIPickerView *genderPicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 50, 0, 0)];
    genderPicker.showsSelectionIndicator = YES;
    genderPicker.backgroundColor = [UIColor whiteColor];
    genderPicker.delegate = self;
    genderPicker.dataSource = self;
    [genderPicker selectRow:1 inComponent:0 animated:YES];
    [genderPicker selectRow:1 inComponent:1 animated:YES];

    [view addSubview:genderPicker];

#pragma mark - UIPickerViewDelegate UIPickerViewDataSource
// pickerView列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 2;
}

// pickerView每列的个数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return 3;
}
//设置标题
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    if (component == 0) {
        return self.genderTitleArray[row];
    } else {
        return self.gendervalueArray[row];
    }

}