Nsarray indexofobject
Web一、NSArray 介绍. NSArray是不可变的，NSMutableArray是可变的，而且只能储存Object-c对象，另外，数组的最后一个元素一定是《nil》表示结束. 这些集合类只能收集cocoa对象（NSOjbect对象），如果想保存一些原始的C数据（例如，int, float, double, BOOL等），则需要将这些原始 ... Web25 aug. 2024 · NSArray简单细说（四）—— 数组的查询与检索 一、- (NSUInteger)indexOfObject: (ObjectType)anObject; 该方法的作用就是：返回相应数组 …
Nsarray indexofobject
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Web19 jun. 2024 · - (NSArray *)objectsAtIndexes:(NSIndexSet *)indexes; 例子如下： NSArray *array = [NSArray arrayWithObjects: @" wendy ", @" andy ", @" tom ", @" test ", nil]; // … Web28 jul. 2013 · 本文作者本着学习的态度,决定仿照NSArray和NSMutableArray 自己实现一个数组类型,当然性能可能没有 NSArray和NSMutableArray 的好,插入100000万条数据,时间上是 NSMutableArray 的三倍左右 ,当然平时使用过程中很少...
Web10 jan. 2024 · indexOf方法的功能 怎么去使用它 注意事项 public int indexOf(Object o) 一，先给大家介绍一下它的功能： 1，传递一个元素给它，如果此列表不包含这个元素，则返回-1。 2，如果包含这个元素：分两种情况。若为null，找到它对应的索引返回。不为null，同样找到对应索引返回。 WebCreating NSArray Objects Using Array Literals In addition to the provided initializers, such as initWithObjects:, you can create an NSArray object using an array literal. In Objective-C, the compiler generates code that makes an underlying call to …
Web-indexOfObject: 返回类型为 NSUInteger 的整数，而不是对象引用。因此，您不应使用 po(打印对象)调试器命令，而应使用 p。 它返回0，而不是nil，这意味着它在数组的第一 … Web31 mei 2015 · -indexOfObject: returns an integer of type NSUInteger, not an object reference.Therefore you should not use po (print object) debugger command, but p.. It returns 0, not nil, what means that it found the object at the first position of the array.If it would not find the object, -indexOfObject: would return NSNotFound. The lowest index …
Web13 sep. 2011 · NSArray's indexOfObject: method. Such as the following: NSUInteger fooIndex = [someArray indexOfObject: someObject]; Share Improve this answer Follow answered Mar 2, 2016 at 13:34 Rajesh Loganathan 11.1k 4 77 90 Add a comment 1 If you're using Swift and optionals make sure they are unwrapped.
Webfunc indexesOfObjects(at: IndexSet, options: NSEnumerationOptions, passingTest: (Any, Int, UnsafeMutablePointer) -> Bool) -> IndexSet. Returns the indexes, from a … good quick birthday giftsWebI have some problem consider indexOfObject method of the objective-C. I encounter a quite weird condition that when i use indexOfObject, and search a string through the NSArray (that the string is not in my array), In my iPad mini (iOS 10.3.3), the value return is -1, while in my IPad2, the value return is 2147483647 (which is defined as ... chest heart and stroke scotland ltdWebThe NSArray class adopts the NSCopying, NSMutable Copying, and NSCoding protocols; custom subclasses of NSArray should override the methods in these protocols as … chest heart and stroke scotland logoWeb3 jun. 2014 · import Foundation extension Array { func contains (object:AnyObject!) -> Bool { if (self.isEmpty) { return false } let array: NSArray = self.bridgeToObjectiveC (); return array.containsObject (object) } func indexOf (object:AnyObject!) -> Int? { var index = NSNotFound if (!self.isEmpty) { let array: NSArray = self.bridgeToObjectiveC (); index = … chest heart and stroke scotland grantsWeb4 jun. 2014 · You can always create an extension that uses NSArray's indexOfObject, e.g: extension Array { func indexOfObject (object:AnyObject) -> Int? { return (self as NSArray).indexOfObject (object) } } You can specify that your array items can be compared with the constraint, then you can cast your object into T and … good quests to do early osrsWeb9 nov. 2016 · When the string begins with a number, the indexOfObject comes back with a ridiculously long number and crashes the app. The array that the users choose are age groups, so if they choose Premature, Newborn, adult female, or adult male everything works fine. If they choose 1 Year, 2 Year, 4 Year, etc. The app crashes. chest heart and stroke scotland starsWeb19 dec. 2024 · iOS indexOfObject使用-(NSUInteger)indexOfObject:(ObjectType)anObject; 点击这里官方文档 Return Value The lowest index whose corresponding array value is … good quick easy dinner recipes