将每个方法添加到NSArray类别中，你会非常需要它

来自ObjectiveSugar的代码

- (void)each:(void (^)(id object))block {
    [self enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        block(obj);
    }];
}

这样做:

for (id object in array) 
{
        // statement
}

下面是如何声明一个字符串数组并遍历它们:

NSArray *langs = @[@"es", @"en", @"pt", @"it", @"fr"];

for (int i = 0; i < [langs count]; i++) {
  NSString *lang = (NSString*) [langs objectAtIndex:i];
  NSLog(@"%@, ",lang);
}

为迅速

let arrayNumbers = [11, 12, 13, 14, 15, 16, 17, 18, 19, 20]

// 1
for (index, value) in arrayNumbers.enumerated() {
    print(index, value)
    //... do somthing with array value and index
}


//2
for value in arrayNumbers {
    print(value)
    //... do somthing with array value
}

适用于OS X 10.4。X和之前:

 int i;
 for (i = 0; i < [myArray count]; i++) {
   id myArrayElement = [myArray objectAtIndex:i];
   ...do something useful with myArrayElement
 }

适用于OS X 10.5。x(或iPhone)及其他版本:

for (id myArrayElement in myArray) {
   ...do something useful with myArrayElement
}

将每个方法添加到NSArray类别中，你会非常需要它

来自ObjectiveSugar的代码

- (void)each:(void (^)(id object))block {
    [self enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        block(obj);
    }];
}