1.創建數組

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//?創建一個空的數組??

NSArray?*array?=?[NSArray?array];??????

//?創建有1個元素的數組??

array?=?[NSArray?arrayWithObject:@"123"];??

//?創建有多個元素的數組??

array?=?[NSArray?arrayWithObjects:@"a",?@"b",?@"c",?nil?nil];??

NSArray?*array3?=?[array?arrayByAddingObjectsFromArray:[NSArray?arrayWithObjects:@"4",?@"5",?nil?nil]];??

??

NSArray?*array4?=?[NSArray?arrayWithObjects:@"1",?@"2",?@"3",?@"4",?nil?nil];??

NSRange?range?=?NSMakeRange(1,?2);??

NSArray?*array5?=?[array4?subarrayWithRange:range];??

2.數組的一些基本方法

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int?count?=?[array?count];//個數??

//?判斷是否包含了某個元素??

if?([array?containsObject:@"a"])?{??

????NSLog(@"包含了字符串a");??

}??

NSString?*last?=?[array?lastObject];最后一個元素??

NSString?*str?=?[array?objectAtIndex:1];根據索引獲取數組中的元素??

int?index?=?[array?indexOfObject:@"c"];獲取指定元素的索引??

//?讓數組里面的所有對象都調用test方法，123為參數??

NSArray?*array?=?[NSArray?arrayWithObjects:stu1,?stu2,?stu3,?nil?nil];??

[array?makeObjectsPerformSelector:@selector(test2:)?withObject:@"123"];??

NSArray?*array?=?[NSArray?arrayWithObjects:@"1",?@"2",?@"3",?@"4",?nil?nil];??

//?1-2-3-4??

//?利用分隔符-拼接所有的數組元素??

NSString?*str?=?[array?componentsJoinedByString:@"-"];??

//?將一個數組寫入文件（生成的是一個xml文件）??

NSString?*path?=?@"/Users/apple/Desktop/array.xml";??

[array?writeToFile:path?atomically:YES];??

path?=?@"/Users/apple/Desktop/array.txt";??

//?從文件中讀取數組內容（文件有嚴格的格式要求）??

NSArray?*array2?=?[NSArray?arrayWithContentsOfFile:path];??

3.遍歷數組

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#pragma?mark?遍歷數組1??

void?arrayFor1()?{??

????NSArray?*array?=?[NSArray?arrayWithObjects:stu1,?@"1",?@"2",?@"3",?nil?nil];??

????int?count?=?array.count;??

????for?(int?i?=?0;?i<count;?i++)?{??

????????id?obj?=?[array?objectAtIndex:i];??

????}??

}??

??

#pragma?mark?遍歷數組2?快速遍歷??

void?arrayFor2()?{??

????Student?*stu1?=?[Student?student];??

????NSArray?*array?=?[NSArray?arrayWithObjects:stu1,?@"1",?@"2",?@"3",?nil?nil];??

????int?i?=0;??

????for?(id?obj?in?array)?{??

????????NSLog(@"%i-%@",?i,?obj);??

????????i++;??

????}??

}??

??

#pragma?mark?遍歷數組3??

void?arrayFor3()?{??

????Student?*stu1?=?[Student?student];??

????NSArray?*array?=?[NSArray?arrayWithObjects:stu1,?@"1",?@"2",?@"3",?nil?nil];??

????[array?enumerateObjectsUsingBlock:??

?????^(id?obj,?NSUInteger?idx,?BOOLBOOL?*stop)?{??

????????NSLog(@"%i-%@",?idx,?obj);??

?????????//?如果索引為1，就停止遍歷??

?????????if?(idx?==?1)?{??

?????????????//?利用指針修改外面BOOL變量的值??

?????????????*stop?=?YES;??

?????????}??

????}];??

}??

??

#pragma?mark?遍歷數組4??

void?arrayFor4()?{??

????Student?*stu1?=?[Student?student];??

????NSArray?*array?=?[NSArray?arrayWithObjects:stu1,?@"1",?@"2",?@"3",?nil?nil];??

????//?獲取數組的迭代器??

????//?NSEnumerator?*enumerator?=?[array?objectEnumerator];??

????//?反序迭代器（從尾部開始遍歷元素）??

????NSEnumerator?*enumerator?=?[array?reverseObjectEnumerator];??

????//?allObjects是取出沒有被遍歷過的對象??

????NSArray?*array2?=?[enumerator?allObjects];??

????NSLog(@"array2:%@",?array2);??

????//?獲取下一個需要遍歷的元素??

????id?obj?=?nil;??

????while?(obj?=?[enumerator?nextObject])?{??

????????NSLog(@"obj=%@",?obj);??

????}??

}??

4.數組排序

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#pragma?mark?數組排序1??

void?arraySort1()?{??

????NSArray?*array?=?[NSArray?arrayWithObjects:@"2",?@"3",?@"1",?@"4",?nil?nil];??

??????

????//?返回一個排好序的數組，原來數組的元素順序不會改變??

????//?指定元素的比較方法：compare:??

????NSArray?*array2?=?[array?sortedArrayUsingSelector:@selector(compare:)];??

????NSLog(@"array2:%@",?array2);??

}??

??

#pragma?mark?數組排序2??

void?arraySort2()?{??

????Student?*stu1?=?[Student?studentWithFirstname:@"MingJie"?lastname:@"Li"];??

????Student?*stu2?=?[Student?studentWithFirstname:@"LongHu"?lastname:@"Huang"];??

????Student?*stu3?=?[Student?studentWithFirstname:@"LianJie"?lastname:@"Li"];??

????Student?*stu4?=?[Student?studentWithFirstname:@"Jian"?lastname:@"Xiao"];??

????NSArray?*array?=?[NSArray?arrayWithObjects:stu1,stu2,stu3,?stu4,?nil?nil];??

????//?指定排序的比較方法??

????NSArray?*array2?=?[array?sortedArrayUsingSelector:@selector(compareStudent:)];??

????NSLog(@"array2:%@",?array2);??

}??

-?(NSComparisonResult)compareStudent:(Student?*)stu?{??

????//?先按照姓排序??

????NSComparisonResult?result?=?[self.lastname?compare:stu.lastname];??

????//?如果有相同的姓，就比較名字??

????if?(result?==?NSOrderedSame)?{??

????????result?=?[self.firstname?compare:stu.firstname];??

????}??

????return?result;??

}??

??

#pragma?mark?數組排序3??

void?arraySort3()?{??

????Student?*stu1?=?[Student?studentWithFirstname:@"MingJie"?lastname:@"Li"];??

????Student?*stu2?=?[Student?studentWithFirstname:@"LongHu"?lastname:@"Huang"];??

????Student?*stu3?=?[Student?studentWithFirstname:@"LianJie"?lastname:@"Li"];??

????Student?*stu4?=?[Student?studentWithFirstname:@"Jian"?lastname:@"Xiao"];??

????NSArray?*array?=?[NSArray?arrayWithObjects:stu1,stu2,stu3,?stu4,?nil?nil];??

??????

????//?利用block進行排序??

????NSArray?*array2?=?[array?sortedArrayUsingComparator:??

?????^NSComparisonResult(Student?*obj1,?Student?*obj2)?{??

?????????//?先按照姓排序??

?????????NSComparisonResult?result?=?[obj1.lastname?compare:obj2.lastname];??

?????????//?如果有相同的姓，就比較名字??

?????????if?(result?==?NSOrderedSame)?{??

?????????????result?=?[obj1.firstname?compare:obj2.firstname];??

?????????}??

???????????

?????????return?result;??

????}];??

??????

????NSLog(@"array2:%@",?array2);??

}??

??

#pragma?mark?數組排序4-高級排序??

void?arraySort4()?{??

????Student?*stu1?=?[Student?studentWithFirstname:@"MingJie"?lastname:@"Li"?bookName:@"book1"];??

????Student?*stu2?=?[Student?studentWithFirstname:@"LongHu"?lastname:@"Huang"?bookName:@"book2"];??

????Student?*stu3?=?[Student?studentWithFirstname:@"LianJie"?lastname:@"Li"?bookName:@"book2"];??

????Student?*stu4?=?[Student?studentWithFirstname:@"Jian"?lastname:@"Xiao"?bookName:@"book1"];??

????NSArray?*array?=?[NSArray?arrayWithObjects:stu1,stu2,stu3,?stu4,?nil?nil];??

??????

????//?1.先按照書名進行排序??

????//?這里的key寫的是@property的名稱??

????NSSortDescriptor?*bookNameDesc?=?[NSSortDescriptor?sortDescriptorWithKey:@"book.name"?ascending:YES];??

????//?2.再按照姓進行排序??

????NSSortDescriptor?*lastnameDesc?=?[NSSortDescriptor?sortDescriptorWithKey:@"lastname"?ascending:YES];??

????//?3.再按照名進行排序??

????NSSortDescriptor?*firstnameDesc?=?[NSSortDescriptor?sortDescriptorWithKey:@"firstname"?ascending:YES];??

????//?按順序添加排序描述器??

????NSArray?*descs?=?[NSArray?arrayWithObjects:bookNameDesc,?lastnameDesc,?firstnameDesc,?nil?nil];??

??????

????NSArray?*array2?=?[array?sortedArrayUsingDescriptors:descs];??

??????

????NSLog(@"array2:%@",?array2);??

}??

轉載于:https://www.cnblogs.com/Free-Thinker/p/4972341.html

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