objective-c-2.0

问题 The compiler seems to have no problem with the two following declarations: NSObject * __weak weakThing; __weak NSObject *anotherWeakThing; Is there a difference between the two? Is the behavior like the const keyword? I ask because Xcode's warning generally suggest ... SomeDataType * __weak / __strong ... when you've goofed something up. So I've tried to follow this pattern, but wondered if there was a difference at all. 回答1: No, there is no difference. With the const keyword, there are

问题 The compiler seems to have no problem with the two following declarations: NSObject * __weak weakThing; __weak NSObject *anotherWeakThing; Is there a difference between the two? Is the behavior like the const keyword? I ask because Xcode's warning generally suggest ... SomeDataType * __weak / __strong ... when you've goofed something up. So I've tried to follow this pattern, but wondered if there was a difference at all. 回答1: No, there is no difference. With the const keyword, there are

问题 Currently I am working on already established application which uses Core plot and in specific its using ScatterPlot to draw a graph. This graph is drawn with values obtained from connected bluetooth device so the graph is dynamically drawn. XY graph with X axis having time value and Y axis having value from BLE device. Now the requirement is to add an out of range value with a label "OL" in the graph and its not a fixed constant value for the bluetooth device(Its more of a state set in model

问题 I have an app where my primary view is a tableview. where each cell loads another view containing certain data. Now, each cell is different so the data in the view loaded by each cell should be different. For that I need the indexPath. I've created a class for the TableView and another class for a simple UIView. How do I forward the indexPath value from one class to the other. Thanks in advance Nik 回答1: If I understand what you are asking you have a TableView (TableView1) in which each cell

问题 I used below code to replace nulls from json response with empty string, but it is not working. Please help me out to fix this issue, i am getting nulls from server response in lot of scenarios and App crashes. Code: - (NSMutableDictionary *)recursive:(NSMutableDictionary *)dictionaryResponse { NSMutableDictionary *dictionary=[[NSMutableDictionary alloc]initWithDictionary:dictionaryResponse]; for (NSString *key in [dictionary allKeys]) { id nullString = [dictionary objectForKey:key]; if (

问题 I used below code to replace nulls from json response with empty string, but it is not working. Please help me out to fix this issue, i am getting nulls from server response in lot of scenarios and App crashes. Code: - (NSMutableDictionary *)recursive:(NSMutableDictionary *)dictionaryResponse { NSMutableDictionary *dictionary=[[NSMutableDictionary alloc]initWithDictionary:dictionaryResponse]; for (NSString *key in [dictionary allKeys]) { id nullString = [dictionary objectForKey:key]; if (

问题 Could someone share some knowledge on whats best practice / code convention on using @property iVars in init methods or designated initializers? please see my example: @interface MyClass () @property(nonatomic,strong) nsstring *tempString; @property(nonatomic,strong) NSMutableArray *arrItems; @end @implementation ViewController - (id)init { if (self = [super init]) { //Is this best practice / correct _tempString = @""; _arrItems = [[NSMutableArray alloc] initWithCapacity:0]; ... ... //Or this

问题 Could someone share some knowledge on whats best practice / code convention on using @property iVars in init methods or designated initializers? please see my example: @interface MyClass () @property(nonatomic,strong) nsstring *tempString; @property(nonatomic,strong) NSMutableArray *arrItems; @end @implementation ViewController - (id)init { if (self = [super init]) { //Is this best practice / correct _tempString = @""; _arrItems = [[NSMutableArray alloc] initWithCapacity:0]; ... ... //Or this

问题 I set a simple tweak using theos following the tutorial here. However when I run make with the headers from here, I get Making all for tweak WelcomeWagon... Preprocessing Tweak.xm... Compiling Tweak.xm... In file included from Tweak.xm:1: /opt/theos//include/SpringBoard/SpringBoard.h:7:26: error: UIApplication.h: No such file or directory cc1objplus: warnings being treated as errors In file included from /opt/theos//include/SpringBoard/UIApplicationDelegate-Protocol.h:7, from /opt/theos/

问题 in my MainViewController implementation, I need to access variables from two different classes. one of the classes is the AppDelegate and the other is the FlipsideViewController. the way I accessed these was through this code: -(void)someMethod { MyApplicationAppDelegate *appDelegate = (MyApplicationAppDelegate *)[[UIApplication sharedApplication] delegate]; FlipsideViewController *viewController = (FlipsideViewController *)[[UIApplication sharedApplication] delegate]; then I have an array I