Objective c 如何将引用变量设置为另一个变量/UILabel变量？

假设我有几行代码来澄清给定UILabel变量的特定设置：

numberMarkings[selectedBoxX][selectedBoxY][selectedSquareX][selectedSquareY][selectedNoteX][selectedNoteY].text = @"derp";      
numberMarkings[selectedBoxX][selectedBoxY][selectedSquareX][selectedSquareY][selectedNoteX][selectedNoteY].center.x = 5;
numberMarkings[selectedBoxX][selectedBoxY][selectedSquareX][selectedSquareY][selectedNoteX][selectedNoteY].center.y = 3;

我想为Obj-C中这个庞大的数组索引指定变量设置一个引用变量（&$varname，在PHP中）。最好的方法是什么？

只需使用指针：

UILabel* label = numberMarkings[selectedBoxX][selectedBoxY][selectedSquareX][selectedSquareY][selectedNoteX][selectedNoteY];
label.text = @"derp";
label.center.x = 5;
label.center.y = 3;

UILabel** label_in_array = &numberMarkings[selectedBoxX]/* ... */[selectedNoteY];
// Write to the label
UILabel* label = *label_in_array;
label.text = @"derp";
// Write to the array
[label release];
*label_in_array = [[UILabel alloc] init]; // Now numberMarkings[][][...][]
                                          // holds a new uilabel object.

因为您没有在数组中写入内容，所以不需要比它更华丽的东西。如果要覆盖数组中的值，则可以使用指向指针的指针：

UILabel* label = numberMarkings[selectedBoxX][selectedBoxY][selectedSquareX][selectedSquareY][selectedNoteX][selectedNoteY];
label.text = @"derp";
label.center.x = 5;
label.center.y = 3;

UILabel** label_in_array = &numberMarkings[selectedBoxX]/* ... */[selectedNoteY];
// Write to the label
UILabel* label = *label_in_array;
label.text = @"derp";
// Write to the array
[label release];
*label_in_array = [[UILabel alloc] init]; // Now numberMarkings[][][...][]
                                          // holds a new uilabel object.