// NSArray(有序)
NSArray *arr = @[@"1",@"2",@"3"];
for (int i = 0; i< arr.count;i++) {
NSLog(@"arrayContent--%@",arr[i]);
}
// NSDictionary(无序)
NSDictionary *dic = @{@"1":@"1",@"2":@"2",@"3":@"3"};
for(int i = 0; i< dic.count;i++)
{
NSString *key = dic.allKeys[I];
NSString *obj = dic[key];
NSLog(@"dicContent--%@",obj);
}
//NSSet(无序)
NSSet *set = [NSSet setWithObjects:@"1",@"2",@"3", nil];
NSArray *setArr = [set allObjects];
for(int i = 0;i< setArr.count;i++){
NSString *obj = setArr[i];
NSLog(@"setContent--%@",obj);
}
//NSArray(有序)
NSArray *arr = @[@"1",@"2",@"3"];
NSEnumerator *enumeratorArr = [arr objectEnumerator];
id objectArr;
while ((objectArr = [enumeratorArr nextObject]) != nil) {
NSLog(@"str:%@",objectArr);
}
//NSDictionary(无序)
NSDictionary *dic = @{@"1":@"1",@"2":@"2",@"3":@"3"};
NSEnumerator *enumeratorDic = [dic keyEnumerator];
id key;
while ((key = [enumeratorDic nextObject]) != nil) {
NSLog(@"str:%@",dic[key]);
}
//NSSet(无序)
NSSet *set = [NSSet setWithObjects:@"1",@"2",@"3", nil];
NSEnumerator *enumeratorSet = [set objectEnumerator];
id setStr;
while ((setStr = [enumeratorSet nextObject]) != nil) {
NSLog(@"str:%@",setStr);
}
//NSArray(反序)
NSArray *arr = @[@"1",@"2",@"3"];
NSEnumerator *enumeratorRever = [arr reverseObjectEnumerator];
id strR;
while ((strR = [enumeratorRever nextObject]) != nil) {
NSLog(@"str:%@",strR);
}
//NSArray
NSArray *arr = @[@"1",@"2",@"3"];
for (NSString *str in arr) {
NSLog(@"arrayContent--%@",str);
}
//NSDictionary
NSDictionary *dic = @{@"1":@"1",@"2":@"2",@"3":@"3"};
for (NSString *key in dic) {
NSString *obj = dic[key];
NSLog(@"dic--%@",obj);
}
//NSSet
NSSet *set = [NSSet setWithObjects:@"1",@"2",@"3", nil];
for (NSString *str in set) {
NSLog(@"set--%@",str);
}
//NSArray
NSArray *arr = @[@"1",@"2",@"3"];
for (NSString *str in [arr reverseObjectEnumerator]) {
NSLog(@"arrayContent--%@",str);
}
//NSArray
NSArray *arr = @[@"1",@"2",@"3"];
[arr enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSLog(@"arrayContent--%@",obj);
if (stop) {
NSLog(@"第%ld遍历",idx);
}
}];
//NSDictionary
NSDictionary *dic = @{@"1":@"1",@"2":@"2",@"3":@"3"};
[dic enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {
NSLog(@"dicContetn-key:%@,obj:%@,stop:%d",key,obj,stop);
}];
//NSSet
NSSet *set = [NSSet setWithObjects:@"1",@"2",@"3", nil];
[set enumerateObjectsUsingBlock:^(id _Nonnull obj, BOOL * _Nonnull stop) {
NSLog(@"str:%@",obj);
}];
通过设置NSEnumerationOptions可以选择类型
NS_OPTIONS(NSUInteger, NSEnumerationOptions) {
NSEnumerationConcurrent = (1UL << 0),//每次迭代并行
NSEnumerationReverse = (1UL << 1),//反向遍历
};
[arr enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSLog(@"arrayContent--%@",obj);
}];
[dic enumerateKeysAndObjectsWithOptions:NSEnumerationReverse usingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {
NSLog(@"dicContetn-key:%@,obj:%@,stop:%d",key,obj,stop);
}];