AttributeError：'bool'对象没有属性'addRasterLayer'

Question

以下是我的代码：

def browseR(self, iface):
    self.iface = iface 
    filename, filter_string = QFileDialog.getOpenFileName(None, "Open RED Band", "", "GeoTIFF(*.tif)")
    if filename is not None:
        self.iface.addRasterLayer(filename, str.split(os.path.basename(filename), ".") [0])