nsmutablearray

问题 For the following code snippet from ViewController.m: - (IBAction)buttonAction:(id)sender { CustomButton *button = (CustomButton *)sender; button.associatedObject = [self.sourceOfObjects.objectArray lastObject]; [self.foo.arrayOfObjects addObject:button.associatedObject]; // this does not work? } • CustomButton is subclass of UIButton and has @property (nonatomic, strong) associatedObject that is a pointer to an object of type NSObject. • sourceOfObjects is a @property (nonatomic, strong) of

问题 I looked for how to dump and array to the console I have mostly found: for (id name in arrayStuff) NSLog (@"Array contents: %d", name); I've tried different formaters %d %@ %g etc. which does print different stuff, but not the values I'm 99% sure are being entered into the object and consequently the array. This doesn't seem to work, how would you know what to use as the formater? I have an NSMutableArray with instance of an object containing one int and two doubles added to the array in each

问题 Is it possible to swizzle the addObject: method of NSMutableArray? Here is what I am trying. #import <Foundation/Foundation.h> #import <objc/runtime.h> @implementation NSMutableArray (LoggingAddObject) + (void)load { Method addObject = class_getInstanceMethod(self, @selector(addObject:)); Method logAddObject = class_getInstanceMethod(self, @selector(logAddObject:)); method_exchangeImplementations(addObject, logAddObject); Method original = class_getInstanceMethod(self, @selector(setObject

问题 Sorry to ask again the question with full description.What i have that i have resultsArray which has title description etc which gets from server but problem is that i want to show this data in sections. So lets say if have three sections which are coming from array then how will populate the data in each section using single resultArray. - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { return [categoryArray objectAtIndex:section]; } resutArray has

问题 I have classes A and B. Can I put these classes in the same NSMutableArray without problems in future? Example: NSMutableArray *maincoll = [[NSMutableArray alloc] init]; ClassA *ca = [[classA alloc] init]; ClassB *cb = [[classB alloc] init]; //here is case [maincoll addObject:ca]; [maincoll addObject:cb]; ... 回答1: Yes. No limitations. The only thing you have to be careful of is when you retrieve items from the array to verify their class (if necessary) before starting to use them. 回答2: Yes.

问题 How to add CGMutablePathRef to NSMutableArray? 回答1: CGMutablePath path = <... your path ...>; [mutableArray addObject:(id)path]; CGPath and CGMutablePath are just opaque CFType object types, and those can be added (via casting to id ) to any Cocoa container classes that are toll-free bridged to their CoreFoundation counter-parts. 回答2: You can wrap CGMutablePathRef to a NSValue and store it in array. Then when needed unwrap it: //Wrap NSValue *pathValue = [NSValue valueWithPointer: path];

问题 How to add CGMutablePathRef to NSMutableArray? 回答1: CGMutablePath path = <... your path ...>; [mutableArray addObject:(id)path]; CGPath and CGMutablePath are just opaque CFType object types, and those can be added (via casting to id ) to any Cocoa container classes that are toll-free bridged to their CoreFoundation counter-parts. 回答2: You can wrap CGMutablePathRef to a NSValue and store it in array. Then when needed unwrap it: //Wrap NSValue *pathValue = [NSValue valueWithPointer: path];

问题 want create a uitableview dynamically with 2 rows in one section i write this code but i have problem the repeats only 2 first rows in all sections now i have this row 0,1 -> section 0 , row 0,1 -> section 1 , row 0,1 -> section 2 want read all rows after for example row 0,1 -> section 0 , row 2,3 -> section 1 , row 4,5 -> section 2 -> row 6,7 items = [[NSMutableArray alloc] init]; - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return items.count/2; } - (NSInteger

问题 want create a uitableview dynamically with 2 rows in one section i write this code but i have problem the repeats only 2 first rows in all sections now i have this row 0,1 -> section 0 , row 0,1 -> section 1 , row 0,1 -> section 2 want read all rows after for example row 0,1 -> section 0 , row 2,3 -> section 1 , row 4,5 -> section 2 -> row 6,7 items = [[NSMutableArray alloc] init]; - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return items.count/2; } - (NSInteger

问题 Because of cocoa design patterns, the name of the instance method count in NSMutableArray is ambiguous; it could either return a saved variable count , or it could count the items in the array each time it's called, and return that (cocoa dictates that a method that simply returns the value of a variable foo be foo , not getFoo ). Does Objective C's NSMutableArray actually count the items every time its count method is called, or does it return the value of a pre-calculated variable? If this