xcode 4, Thread 1:Program received signal:"EXC_BAD_ACCESS."

When i adde开发者_JAVA百科d the code(textField.text=preTotalNumber;) in the method(onButtonPressed),the failure appeared. Can anyone please help me?thk

---

preTotalNumber should be an NSString, and if not you should convert it to NSString. for instance if it's an integer you can use the following:

[NSString stringWithFormat:@"%d", preTotalNumber];