未接收新值的字符串始终为 (null)
这里正在发生奇怪的事情。
NSString *string = [powerPickerVC.powerList objectAtIndex:selRow];
NSLog(@"powerPicker row = %@", string); //this returns me the string from powerList
repVC.selectedPower = string; //selectedPower doesn't receive the new value and returns (null)
NSLog(@"selectedPower = %@", repVC.selectedPower);
而且repVC.selectedPower总是返回(null)！
就在那段代码之前，我有这样的：
selectedRowPower = [powerPickerVC.powerPicker selectedRowInComponent:0];
repVC.selectedRowInObjectPicker = selectedRowPower;
NSLog(@"selectedRowInObjectPicker = %d", selectedRowPower);
而且效果很好。 selectedRowInObjectPicker 是一个 NSInteger，但如果我能够设置它的值，为什么我无法设置 selectedPower 的值？
是的，物体被合成了，一切......
Weird thing is happening here.
NSString *string = [powerPickerVC.powerList objectAtIndex:selRow];
NSLog(@"powerPicker row = %@", string); //this returns me the string from powerList
repVC.selectedPower = string; //selectedPower doesn't receive the new value and returns (null)
NSLog(@"selectedPower = %@", repVC.selectedPower);
And repVC.selectedPower is always returning (null)!
Just before that piece of code, I have this:
selectedRowPower = [powerPickerVC.powerPicker selectedRowInComponent:0];
repVC.selectedRowInObjectPicker = selectedRowPower;
NSLog(@"selectedRowInObjectPicker = %d", selectedRowPower);
And that works perfectly. selectedRowInObjectPicker is an NSInteger but if I'm able to set its value, why am I not being able to set selectedPower's value?
Yes, the object is synthesized and everything...
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评论（3）
repVC很有可能是nil。尝试在那里添加断点看看。High chance that
repVCisnil. Try to add breakpoint there and see.您是否定义了一个名为
-setSelectedPower:的方法？Have you defined a method called
-setSelectedPower:by any chance?使用 [NSString stringWithString: ] 初始化字符串。
在你的情况下，
repVC.selectedPower = [[NSString stringWithString:string];
并确保接收者是按预期正确声明的 NSString。
Use the [NSString stringWithString: ] to initialize strings.
In your case,
repVC.selectedPower = [[NSString stringWithString:string];
And ensure the receiver is a properly declared NSString as intended.