ios编程-格式字符串未使用数据参数
当我运行以下代码时，我收到 Data argument not use by format string 错误：
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
NSString *colour = ([colourArray objectAtIndex:row]);
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:(colour) forKey:@"colour"];
NSLog(@"NSString =", colour);
NSLog(@"NSUserDefaults =", [defaults objectForKey:@"colour"]);
}
我在两行 NSLog 行上都收到错误。另外，日志内容如下：
2011-10-25 09:01:50.260 Random[35636:b303] NSString =
2011-10-25 09:01:50.260 Random[35636:b303] NSUserDefaults =
谢谢， 亚瑟
I get a Data argument not used by format string error when I run the following code:
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
NSString *colour = ([colourArray objectAtIndex:row]);
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:(colour) forKey:@"colour"];
NSLog(@"NSString =", colour);
NSLog(@"NSUserDefaults =", [defaults objectForKey:@"colour"]);
}
I get the error on both NSLog lines. Also, here is what the log says:
2011-10-25 09:01:50.260 Random[35636:b303] NSString =
2011-10-25 09:01:50.260 Random[35636:b303] NSUserDefaults =
Thank you,
Arthur
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有问题
应该是
本例中的格式说明符是用于打印
对象的%@。要打印数字，您可以使用类似%d的内容。 在此处查看完整文档。Is problematic
Should be
The format specifier in this case is the
%@which is used to print anobject. To print numbers you'd use something like%d. See complete documentation here.@debuggerman 的回答绝对正确。但是，如果您使用
[defaults setObject:colour forKey:@"colour"];而不是[defaults setObject:(colour) forKey:@"colour"];< /code>请注意，我删除了对象
颜色的括号。Answer from @debuggerman is absolutely correct. But you can improve your code if you use
[defaults setObject:colour forKey:@"colour”];instead of[defaults setObject:(colour) forKey:@"colour"];Note that I removed the parentheses for object
colour.