Objective-C：NSMutableString 错误
我不断收到此代码的错误，应用程序告诉我我正在尝试改变一个不可变的对象。有人可以看一下并解释我做错了什么吗？谢谢。
thisrow = [NSString stringWithFormat:@"%i", startPointX2];
NSMutableString* setCoordStr = [[NSMutableString alloc] init];
[setCoordStr appendFormat: thisrow];
if(w==1) {
thiscol = [NSString stringWithFormat:@"%i", endPointY];
[setCoordStr insertString:thiscol atIndex:[setCoordStr length]];
} else {
for(startPointY; startPointY<endPointY+1; startPointY++) {
thiscol = [NSString stringWithFormat:@"%i", startPointY];
[setCoordStr insertString:thiscol atIndex:[setCoordStr length]];
}
}
NSLog(@"%@ ", setCoordStr);
I keep getting an error with this code, the app is telling me I am trying to mutate an object which is not mutable. Can someone take a look and explain what I am doing wrong? Thanks.
thisrow = [NSString stringWithFormat:@"%i", startPointX2];
NSMutableString* setCoordStr = [[NSMutableString alloc] init];
[setCoordStr appendFormat: thisrow];
if(w==1) {
thiscol = [NSString stringWithFormat:@"%i", endPointY];
[setCoordStr insertString:thiscol atIndex:[setCoordStr length]];
} else {
for(startPointY; startPointY<endPointY+1; startPointY++) {
thiscol = [NSString stringWithFormat:@"%i", startPointY];
[setCoordStr insertString:thiscol atIndex:[setCoordStr length]];
}
}
NSLog(@"%@ ", setCoordStr);
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您可以使用
appendString:而不是第一个appendFormat:和insertString:atIndex:You could used
appendString:instead of your firstappendFormat:and yourinsertString:atIndex: