如何將Objective C重寫爲RubyMotion

Question

我正嘗試重置按鈕單擊上的UIPickerView。搜索的StackOverflow後，我發現：

[picker reloadAllComponents]; 
[picker selectRow:0 inComponent:0 animated:YES]; 

我重寫它在紅寶石這樣的：

def reset_picker 
    @picker.reloadAllComponents 
    @picker.selectRow(0, inComponent: 0, animated: true) 
    end 

上面僅重置第一分量;我如何重置所有三個組件？我知道在reset_picker方法中有些事情要做inComponent：0。

下面是UIPickerView方法調用：

def numberOfComponentsInPickerView(pickerView) 
    component_options.count 
    end 

    def pickerView(pickerView, numberOfRowsInComponent: component) 
    component_options[component].count 
    end 

    def pickerView(pickerView, titleForRow: row, forComponent: component) 
    component_options[component][row] 
    end 

Answer 1

你是正確的 - inComponent: 0涉及組件的索引。

考慮到這一點，重置所有三個組件，你只需要：

def reset_picker 
    @picker.reloadAllComponents 
    @picker.selectRow(0, inComponent: 0, animated: true) 
    @picker.selectRow(0, inComponent: 1, animated: true) 
    @picker.selectRow(0, inComponent: 2, animated: true) 
end