-(void)iteratorWithBlock
{
//////////处理数组//////////
NSArray *arrayM = @[@"1",@"2",@"3",@"4"];
[arrayM enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSLog(@"%zd--%@",idx,obj);
}];
//////////处理字典//////////
NSDictionary *dictM = @{@"1":@"one",@"2":@"two",@"3":@"three"};
[dictM enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {
NSLog(@"%@:%@",key,obj);
}];
//////////处理集合//////////
NSSet * setM = [[NSSet alloc] initWithObjects:@"one",@"two",@"three",@"four", nil];
[setM enumerateObjectsUsingBlock:^(id _Nonnull obj, BOOL * _Nonnull stop) {
NSLog(@"%@",obj);
}];
//////////反向遍历----降序遍历----以数组为例
NSArray *arrayM2 = @[@"1",@"2",@"3",@"4"];
[arrayM2 enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSLog(@"%zd--%@",idx,obj);
}];
}
