这是我正在做的:-(void)doCreateGroup{[[selfcontentView]endEditing:true];NSString*newString=[[[[selfcontentView]groupNameField]text]stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]];NSString*firstError=nil;if([newStringlength]==0){firstError=@"Missinggroupname";}NSError*gr