iOS loop through NSMutableArray of objects

Question

Is there a efficient way too loop through an NSMutableArray containing custom objects?

This is how to init and add objects to my NSMutableArray :

self.messages = [[NSMutableArray alloc] initWithObjects:nil];
[self.messages addObject:[[JSMessage alloc] initWithText:message sender:name date:myDate livePreview:@"1"]];

What i want to do specifically is to loop through the NSMutableArray and look for where the "livePreview" key is 1 and then update the message on that object.

How could this be done?

Answer 1

for (JSMessage * message in self.messages) {
   if ([message.livePreview isEqualToString:@"1"]) {
      message.message = @"updated message";
   }
 }

Answer 2

您还可以看一下NSArray基于块的API来检查元素

- (void)enumerateObjectsUsingBlock:(void (^)(id obj, NSUInteger idx, BOOL *stop))block