iOS Crash之NSInternalInconsistencyException

NSInternalInconsistencyException，从它的字面意思来看的话，是不一致导致的，下面就一些例子

1. NSMutableDictionary的错误使用

比如把NSDictionary当做NSMutableDictionary来使用，从他们内部的机理来说，就会产生一些错误，NSMutableDictionary中有很多NSDictionary不支持的接口

NSString *result = @"{\"username\”:\”aaa\”,\"phone\":\"15666666666\",\"bankcount\":\"98765432112345678\"}";
NSData *data = [result dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *info = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
if (info) {
NSString *username = [Utils UrlDecode: info[@"username"]];
[info  setObject:username forKey:@"username"];
}

执行上述代码后报错：

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object'

出错原因在于：

[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];

返回的结果是immutable对象，不能直接对immutable进行赋值操作，否则会报错。

修改后代码：

NSString *result = @"{\"username\”:\”aaa\”,\"phone\":\"15666666666\",\"bankcount\":\"98765432112345678\"}";
NSData *data = [result dataUsingEncoding:NSUTF8StringEncoding];
//－－－－将immutable转换为mutable－－－－
NSDictionary *temp = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
NSMutableDictionary *info = [NSMutableDictionary dictionaryWithDictionary:temp];
//－－－－－－－－－－－－－－－－－－－－－－
if (info) {
NSString *username = [Utils UrlDecode:info[@"username"]];
[info  setObject:username forKey:@"username"];
}

2. 界面使用不当

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException',
reason: 'Could not load NIB in bundle: 'NSBundle </var/mobile/Applications/74075F37-7B13-4D39-8686-050402501AE0/CanUSee.app> (loaded)' with name 'ViewController''

其中一个原因是:
在AppDelegate.m的- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary
*)launchOptions中使用xib文件初始化，但程序的入口是storyboard，didFinishLaunching不需要写东西

self.viewController = [[ViewController alloc] initWithNibName: @"ViewController"
bundle: nil];
工程里面没有ViewController.xib，初始化出错