#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool { NSMutableArray *array = [[NSArray arrayWithObjects:@"one",@"two",@"three",@"two", nil] mutableCopy]; //1.C语言中的遍历方式 for (int i = 0; i<[array count]; i++) { NSLog(@"array[%d]:%@",i,[array objectAtIndex:i]); } //2.***快速枚举 //参数1 每次得到数组中元素的引用 //参数2 哪一个集合/组合 NSMutableArray *removeStrs = [NSMutableArray array]; for (NSString *str in array) { if ([str isEqualToString:@"two"]) { //临时保存要删除的内容 [removeStrs addObject:str]; } NSLog(@"str:%@",str); } //[array removeObject:removeStr]; for (NSString *removeStr in removeStrs) { [array removeObject:removeStr]; } NSLog(@"array:%@",array); //3.迭代器遍历 //可以得到数组或集合相应的替代器 NSEnumerator *enumertator = [array objectEnumerator]; //得到迭代器指向的内存空间的引用 //并且会自动向下移动一位,当超出数组或集合的范围则返回nil值 //[enumertator nextObject]; NSString *str = nil; while (str = [enumertator nextObject]) { NSLog(@"str2:%@",str); }
} return 0; } |