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问题描述
目标C和iphone的速度更快?自我枚举或for循环?
What is faster in objective C and iphone? self enumeration or for loop?
我有两个代码片段,可以帮助我比较。
i have 2 fragments of code to help me compare.
我们有一个事实,数组是一个NSMutableArray与x项目。 案例1:
for this example we have as a fact that array is an NSMutableArray with "x" items. Case 1:
-(void)findItem:(Item*)item { Item *temp; for (int i = 0 ;i<[array count];i++) { temp = [array objectAtIndex:i]; if(item.tag == temp.tag) return; } }案例2:
-(void)findItem:(Item*)item { for(Item *temp in array) { if(item.tag == temp.tag) return; } }很明显case2更快, ?
it is almost obvious that case2 is faster, is it?
推荐答案这称为快速枚举。
请参阅: cocoawithlove/2008/05/fast-enumeration-clarifications.html
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什么是更快?枚举VS For循环
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