- (void)enumerateObjectsUsingBlock:(void (NS_NOESCAPE ^)(ObjectType? ?obj ,NSUInteger idx,BOOL*stop))blockAPI_AVAILABLE(mac os(10.6),? ios(4.0), watch os(2.0), tv os(9.0));

方法描述：

Executes a given block using each object in the array, starting with the first object and continuing through the array to the last object.

執(zhí)行一個(gè)給定的block，使用數(shù)組中的每個(gè)對(duì)象。以第一個(gè)元素開(kāi)始，繼續(xù)直到最后一個(gè)元素。

If the block parameter is nil this method will raise an exception. Values allocated within the block will be deallocated after the block is executed. Use?retain?to explicitly maintain those values.

如果定義的block為nil，將會(huì)拋出異常。當(dāng)block執(zhí)行完畢后，block中allocation的值將會(huì)釋放。使用retain來(lái)?yè)碛邢胍獡碛械闹怠?/p>

This method executes synchronously.

這個(gè)方法的是同步執(zhí)行的。

參數(shù)描述：

block：

The block to apply to elements in the array.

在數(shù)組中申請(qǐng)?jiān)氐腷lock。

The block takes three arguments:

block擁有三個(gè)參數(shù)。

obj

The element in the array.

數(shù)組中的元素。

idx

The index of the element in the array.

數(shù)組中元素的index。

stop

A reference to a Boolean value. The block can set the value to YES to stop further enumeration of the array. If a block stops further enumeration, that block continues to run until it’s finished. The stop argument is an out-only argument. You should only ever set this Boolean toYES within the block.

是一個(gè)bool值的引用，block可以把這個(gè)值設(shè)置為yes來(lái)阻止接下來(lái)的數(shù)組遍歷。如果block阻止了遍歷，block會(huì)把此次遍歷執(zhí)行完。stop僅僅是一個(gè)跳出參數(shù)，你只能設(shè)置它為yes。