ios - 如何格式化 iOS 7 UIPickerView 以仅显示 3 个选项？ IE。一上一下主动选择？

我想将 iOS 7 UIPickerView 格式化为仅显示三个选项。 IE。一个在所选选项之上，一个在所选选项之下。我还想将文本格式化为小于默认值。我如何做到这一点？

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Best Answer-推荐答案

实现这些委托(delegate)方法将为您提供一个包含 3 行的选择器 View ，并让您自定义字体、颜色等...

    - (NSInteger)numberOfComponentsInPickerViewUIPickerView *)pickerView {
        return 1;
    }

    - (UIView *)pickerViewUIPickerView *)pickerView viewForRowNSInteger)row forComponentNSInteger)component reusingViewUIView *)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)pickerViewUIPickerView *)pickerView numberOfRowsInComponentNSInteger)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 个选项？ IE。一上一下主动选择？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22603290/