HarrisHan

netstat -vanp tcp | grep 3000
sudo lsof -i tcp:3000
kill -9 PID
kill $(lsof -t -i :YOUR_PORT_NUMBER)


echo 'free-port() { kill "$(lsof -t -i :$1)"; }
kill-port() { kill -kill "$(lsof -t -i :$1)"; }' \
>> ~/.bashrc && source ~/.bashrc

HarrisHan

- (void)createClass
{
    Class MyClass = objc_allocateClassPair([NSObject class], "myclass", 0);
    //添加一个NSString的变量，第四个参数是对其方式，第五个参数是参数类型
    if (class_addIvar(MyClass, "itest", sizeof(NSString *), 0, "@")) {
        NSLog(@"add ivar success");
    }
    //myclasstest是已经实现的函数，"v@:"这种写法见参数类型连接
    class_addMethod(MyClass, @selector(myclasstest:), (IMP)myclasstest, "v@:");
    //注册这个类到runtime系统中就可以使用他了

HarrisHan

+ (NSDate *)beginningOfDay:(NSDate *)date;

{
    
    NSCalendar *cal = [NSCalendar currentCalendar];
    
    NSDateComponents *components = [cal components:( NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitYear | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond ) fromDate:date];
    
    [components setHour:0];
    

HarrisHan

- (void)startTimer
{
    self.leftSecondsNum = 59;
    self.fetchCodeBtn.enabled = NO;
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(refreshCountNum) userInfo:nil repeats:YES];
    [self.fetchCodeBtn setTitle:[NSString stringWithFormat:@"重新获取(%ld)", (long)self.leftSecondsNum] forState:UIControlStateDisabled];
}

- (void)endupTimer
{

HarrisHan

- (void)startTimer
{
    self.leftSecondsNum = 59;
    self.fetchCodeBtn.enabled = NO;
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(refreshCountNum) userInfo:nil repeats:YES];
    [self.fetchCodeBtn setTitle:[NSString stringWithFormat:@"重新获取(%ld)", (long)self.leftSecondsNum] forState:UIControlStateDisabled];
}

- (void)endupTimer
{

HarrisHan

- (void)startTimer
{
    self.leftSecondsNum = 59;
    self.fetchCodeBtn.enabled = NO;
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(refreshCountNum) userInfo:nil repeats:YES];
    [self.fetchCodeBtn setTitle:[NSString stringWithFormat:@"重新获取(%ld)", (long)self.leftSecondsNum] forState:UIControlStateDisabled];
}

- (void)endupTimer
{

HarrisHan

- (void)startTimer
{
    self.leftSecondsNum = 59;
    self.fetchCodeBtn.enabled = NO;
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(refreshCountNum) userInfo:nil repeats:YES];
    [self.fetchCodeBtn setTitle:[NSString stringWithFormat:@"重新获取(%ld)", (long)self.leftSecondsNum] forState:UIControlStateDisabled];
}

- (void)endupTimer
{

HarrisHan

@implementation UIView (ScreenShot)

- (UIImage *)apo_screenshotImage
{
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0.0);
    [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:NO];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

HarrisHan

+ (NSUInteger)countLengthOfString:(NSString *)textString {

    NSUInteger strlength = 0;
    
    char *p = (char *)[textString cStringUsingEncoding:NSUnicodeStringEncoding];
    
    for (int i = 0; i < [textString lengthOfBytesUsingEncoding:NSUnicodeStringEncoding]; i++) {
        if (*p) {
            p++;
            strlength++;