如何以毫秒为单位准确记录方法的执行时间?

问题描述

有没有办法确定一个方法需要执行多长时间(以毫秒为单位)?

Is there a way to determine how much time a method needs to execute (in milliseconds)?

推荐答案

NSDate *methodStart = [NSDate date];

/* ... Do whatever you need to do ... */

NSDate *methodFinish = [NSDate date];
NSTimeInterval executionTime = [methodFinish timeIntervalSinceDate:methodStart];
NSLog(@"executionTime = %f", executionTime);

斯威夫特:

let methodStart = NSDate()

/* ... Do whatever you need to do ... */

let methodFinish = NSDate()
let executionTime = methodFinish.timeIntervalSinceDate(methodStart)
print("Execution time: (executionTime)")

Swift3:

let methodStart = Date()

/* ... Do whatever you need to do ... */

let methodFinish = Date()
let executionTime = methodFinish.timeIntervalSince(methodStart)
print("Execution time: (executionTime)")

易于使用且具有亚毫秒级精度.

Easy to use and has sub-millisecond precision.

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