ios - 如何格式化iOS 7 UIPickerView以仅显示3个选择？即主动选择之上一之下？

我想格式化iOS 7 UIPickerView以仅显示三个选择。即所选选项上方一个，下方下方一个。我还想将文本格式设置为小于默认值。我该如何实现？

最佳答案

实现这些委托方法将为您提供3行选择器视图，并允许您自定义字体，颜色等。

    - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
        return 1;
    }

    - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {

        UILabel *pickerRowLabel = (UILabel *)view;

        if (pickerRowLabel == nil) {
            CGRect frame = //YOUR PICKERVIEW FRAME. HEIGHT IS 44 by default.
            pickerRowLabel = [[UILabel alloc] initWithFrame:frame];
           //FORMAT THE FONT FOR THE LABEL AS YOU LIKE
            pickerRowLabel.backgroundColor = [UIColor clearColor];
            pickerRowLabel.userInteractionEnabled = YES;
        }

        pickerRowLabel.text = //YOUR TEXT, MOST LIKELY FROM AN ARRAY ... ?

        return pickerRowLabel;
    }

    - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {

        return 3; //MOST LIKELY YOUR ARRAY OF OBJECTS COUNT
    }

关于ios - 如何格式化iOS 7 UIPickerView以仅显示3个选择？即主动选择之上一之下？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/22603290/