189 8069 5689
NSMutableArray *array = [NSMutableArray arrayWithObjects:@"12",@"84", @"35", @"70", @"85", @"99", nil];
NSInteger count = [array count];
for (int i = 0; i < count; i++) {
for (int j = 0; j < count - i - 1; j++) {
// if ([[array objectAtIndex:j] intValue] > [[array objectAtIndex:(j + 1)] intValue]) { //这里在用[array objectAtIndex:j]时候必须intValue
// if([[array objectAtIndex:j] compare:[array objectAtIndex:j + 1]] == -1){ //这里整体必须有一个返回值，－1，0，1，因为compare的返回值NSComparisonResult是一个枚举类型的值，所以要返回一个值
if([[array objectAtIndex:j] compare:[array objectAtIndex:j + 1] options:NSNumericSearch] == 1){ //同上potions NSNumericSearch = 64,
[array exchangeObjectAtIndex:j withObjectAtIndex:(j + 1)]; //这里可以用exchangeObjectAtIndex:方法来交换两个位置的数组元素。
}
}
}
for (NSString *i in array) {
NSLog(@"%@", i);
}
NSMutableArray *array1 = [NSMutableArray arrayWithObjects:@"12",@"84", @"35", @"70", @"85", @"99", nil];
[array1 sortUsingSelector:@selector(compare:)];
NSLog(@"%@", array);
//compare方法
// - (NSComparisonResult)compare:(NSString *)aString 这李返回的NSComparisonResult是按照第一位开始比较的 ，
//NSComparisonResult
// These constants are used to indicate how items in a request are ordered.
//
// enum { //枚举类型的值
// NSOrderedAscending = -1,
// NSOrderedSame,
// NSOrderedDescending
// };
// typedef NSInteger NSComparisonResult;
// Search and Comparison Options
enum {
NSCaseInsensitiveSearch = 1,
NSLiteralSearch = 2,
NSBackwardsSearch = 4,
NSAnchoredSearch = 8,
NSNumericSearch = 64,
NSDiacriticInsensitiveSearch = 128,
NSWidthInsensitiveSearch = 256,
NSForcedOrderingSearch = 512,
NSRegularExpressionSearch = 1024
};
// Constants
// NSCaseInsensitiveSearch//大小写敏感的 。
// A case-insensitive search.
// Available in iOS 2.0 and later.
// Declared in NSString.h.
//
// NSLiteralSearch//
// Exact character-by-character equivalence.
// Available in iOS 2.0 and later.
// Declared in NSString.h.
//
// NSBackwardsSearch //从后往前比较
// Search from end of source string.
// Available in iOS 2.0 and later.
// Declared in NSString.h.
//
// NSAnchoredSearch
// Search is limited to start (or end, if NSBackwardsSearch) of source string.
// Available in iOS 2.0 and later.
// Declared in NSString.h.
//
// NSNumericSearch //交换比较
// Numbers within strings are compared using numeric value, that is, Name2.txt < Name7.txt < Name25.txt.
// Numeric comparison only applies to the numerals in the string, not other characters that would have meaning in a true number such as a negative sign or a decimal point.
// This option only applies to compare methods, not find.
// Available in iOS 2.0 and later.
// Declared in NSString.h.
//
// NSDiacriticInsensitiveSearch
// Search ignores diacritic marks.
// For example, ‘’ is equal to ‘o’.
// Available in iOS 2.0 and later.
// Declared in NSString.h.
//
// NSWidthInsensitiveSearch
// Search ignores width differences in characters that have full-width and half-width forms, as occurs in East Asian character sets.
// For example, with this option, the full-width Latin small letter 'a' (Unicode code point U+FF41) is equal to the basic Latin small letter 'a' (Unicode code point U+0061).
// Available in iOS 2.0 and later.
// Declared in NSString.h.
//
// NSForcedOrderingSearch
// Comparisons are forced to return either NSOrderedAscending or NSOrderedDescending if the strings are equivalent but not strictly equal.
// This option gives stability when sorting. For example, “aaa” is greater than "AAA” if NSCaseInsensitiveSearch is specified.
// Available in iOS 2.0 and later.
// Declared in NSString.h.
//
//
// NSRegularExpressionSearch
// The search string is treated as an ICU-compatible regular expression. If set, no other options can apply except NSCaseInsensitiveSearch and NSAnchoredSearch. You can use this option only with the rangeOfString:... methods and排序
专注于为中小企业提供成都网站设计、做网站服务,电脑端+手机端+微信端的三站合一,更高效的管理,为中小企业双流免费做网站提供优质的服务。我们立足成都，凝聚了一批互联网行业人才，有力地推动了数千家企业的稳健成长，帮助中小企业通过网站建设实现规模扩充和转变。
数组排序取决于判断条件，判断条件决定了排序方式（生序，降序）
IOS为数组类提供类排序方法，同时提供类接口让我们传递判断条件
数组默认排序
［array sortedArrayUsingSelector:<#SEL#>］
[mutableArray sortUsingSelector:<#SEL#>]
@selector,获取方法名，这个方法是数组中元素的方法
默认使用升序排列