iOS常见遍历方法汇总

一。for循环

NSArray *iosArray = @[@"L", @"O", @"V", @"E", @"I", @"U", @"T"];

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

//处理数组中数据

NSLog(@"%@", iosArray[i]);

}

二。快速遍历（for...in）

NSArray *iosArray = @[@"L", @"O", @"V", @"E", @"I", @"U", @"T"];

for (NSString *obj in iosArray) {

//处理数组中的数据

NSLog(@"%@", obj);

}

三。NSEnumerator(NSEnumerator是一个抽象的基类)

NSArray *iosArray = @[@"L", @"O", @"V", @"E", @"I", @"U", @"T"];

NSMutableArray *Array = [NSMutableArray arrayWithArray:iosArray];

//并发遍历

[Array enumerateObjectsWithOptions:NSEnumerationConcurrent usingBlock:^(NSString *obj, NSUInteger idx, BOOL * _Nonnull stop) {

obj = [NSString stringWithFormat:@"_%@", obj];

[Array replaceObjectAtIndex:idx withObject:obj];

NSLog(@"%@", obj);

if ([obj isEqualToString:@"_I"]) {

*stop = YES;

}

}];

// 正向遍历

[iosArray enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

NSLog(@"－－－－%@", obj);

if ([obj isEqualToString:@"E"]) {

*stop = YES;

}

}];

// 反向遍历

[iosArray enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(NSString *obj, NSUInteger idx, BOOL * _Nonnull stop) {

NSLog(@"%@", obj);

if ([obj isEqualToString:@"E"]) {

*stop = YES;

}

}];