#pragma mark - 查看代码的执行时间
#define TICK NSDate *startTime = [NSDate date]
#define TOCK NSLog(@"Time: %f", -[startTime timeIntervalSinceNow])
TICK
//do your work here
TOCK
#pragma mark - 查看代码的执行时间
#define TICK NSDate *startTime = [NSDate date]
#define TOCK NSLog(@"Time: %f", -[startTime timeIntervalSinceNow])
TICK
//do your work here
TOCK

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