NSArray的四种遍历方法 - 黑马程序员技术交流社区

//第一种遍历：普通for循环
long int count = [array count];
for (int i = 0 ; i < count; i++) {
NSLog(@"1遍历array: %zi-->%@",i,[array objectAtIndex:i]);
}
//第二种遍历：快速for循环,需要有外变量i
int i = 0;
for (id obj in array) {
NSLog(@"2遍历array：%zi-->%@",i,[array objectAtIndex:i]);
i++;
}
//第三种遍历：OC自带方法enumerateObjectsUsingBlock:
//默认为正序遍历
[array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"3遍历array：%zi-->%@",idx,obj);
}];
//NSEnumerationReverse参数为倒序遍历
[array enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"4倒序遍历array：%zi-->%@",idx,obj);
}];
//第四种遍历：利用枚举
NSEnumerator *en = [array objectEnumerator];
id obj;
int j = 0 ;
while (obj = [en nextObject]) {
NSLog(@"5遍历array：%d-->%@",j,obj);
j++;
}

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