Nsarray indexofobject
Web1 mei 2024 · 与 NSArray 对象不同的是,一个 PHFetchResult 对象中的内容是动态加载的,如果你需要一些内容它才会去照片库中去获取对应的内容,这可以在处理大量的结果的时候提供一个最佳的性能。. 获取结果 对它包含的内容提供线程安全的访问。. 在一次获取之后, … Webfunc indexOfObject(passingTest: (Any, Int, UnsafeMutablePointer) -> Bool) -> Int. Returns the index of the first object in the array that passes a test in a given block. …
Nsarray indexofobject
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WebI 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 ... 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:返回相应数组值等于给定对象的最低索引。 返回值表示相应数组值等于anObject的最低索引。 如果数组中的任何对象都不等于anObject,则返回 NSNotFound 。 从索引0开始,数组的每个元素作为 …
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 ... Web31 dec. 2024 · if ( [pagesArray indexOfObject:pageView]) { //do something } This is because indexOfObject always returns a number. It's just that if the item isn't in the array then the number is the maximum possible number; a number that is equal to NSNotFound. So we'd know if a page was not in our array by testing in this way:
Web4 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 …
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 …
Web8 nov. 2015 · NSArray * newArray = [array sortedArrayUsingFunction: compareTwoObjects context: "testString"]; 数组排序方法sortedArrayUsingFunction:context:在官方文档里有很 … rock bands of 1965Web-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 … ostrich farm apartments south pasadenaWeb25 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 … rock bands of 2014Web10 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。 rock bands of 1968Web8 nov. 2015 · OC数组NSArray 对比 c数组 和 oc数组对象(指针)定义 int array[10]; NSArray *array;特点: 元素类型必须相同, 元素可以是任意对象 而且只能c的数据类型 但 objective-c系列-NSArray - 向日夏 - 博客园 ostrich farm al ainWeb26 aug. 2015 · NSNumber *indexOfAlarm = [self.dbManager.arrColumnNames indexOfObject:@"Time"]; cell.timeLabel.text = [NSString stringWithFormat:@"%@", [ [self.arrAlarmInfo objectAtIndex:indexPath.row]objectAtIndex:indexOfAlarm.intValue] ]; Share Improve this answer Follow answered Aug 26, 2015 at 11:05 serdaryillar 413 5 15 … ostrich-farmingWebThe NSArray class adopts the NSCopying, NSMutable Copying, and NSCoding protocols; custom subclasses of NSArray should override the methods in these protocols as … ostrich farm curacao