我正在尝试使用 NSMutableArray 的 NSMutableArray 存储一个数组 int[9][9],在其中存储来自数组的 81 个整数:
- (void)awakeFromNib {
// initialization matrix
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
matrix[i][j] = 0;
}
}
// Creating NSMutableArray instance
TGrid = [NSMutableArray arrayWithCapacity:10];
[self saveGrid];
}
- (void)saveGrid {
NSNumber *aInt;
NSMutableArray *Grid = [NSMutableArray arrayWithCapacity:81];
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
aInt = [NSNumber numberWithInt:matrix[i][j]];
[Grid addObject:aInt];
}
}
[TGrid addObject:Grid];
}
- (IBAction)undo:(id)sender {
[TGrid removeLastObject];
NSMutableArray *Grid = [TGrid lastObject];
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
matrix[8-i][8-j] = [[Grid lastObject] intValue];
[Grid removeLastObject];
}
}
}
当 awakeFromNib 方法首次调用 saveGrid 时,它会起作用。但是当我改变我的矩阵时,它再次调用 saveGrid,这次我得到了这个错误:
*由于未捕获的异常“NSInvalidArgumentException”而终止应用程序,原因:“-[CALayerArray addObject:]: unrecognized selector sent to instance 0x4b36ce0”
我需要你的帮助 !谢谢 !