1.UITextView垂直居中顯示文字猪杭，先設置好布局。因為UITextView集成自UIScrollView基显，所以設置偏移量就可以了

//textView的contentSize屬性
    CGSize contentSize = textView.contentSize;
    //如果文字內(nèi)容高度沒有超過textView的高度
    if(contentSize.height <= textView.frame.size.height) {
        //textView的高度減去文字高度除以2就是Y方向的偏移量戚嗅，也就是textView的上內(nèi)邊距
        CGFloat offsetY = (textView.frame.size.height - contentSize.height)/2;
        UIEdgeInsets offset = UIEdgeInsetsMake(offsetY, 0, 0, 0);
        [textView setContentInset:offset];
    }

2.判斷是否是網(wǎng)頁的正則

NSString *reg = @"((http[s]{0,1}|ftp)://[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)|(www.[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)";
    NSPredicate *urlPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", reg];
    return [urlPredicate evaluateWithObject:url];

3.判斷字符串是不是NULL

+(BOOL)IsNotEmpty:(id)string
{
    BOOL result = NO;
    if (![string isKindOfClass:[NSNull class]])
    {
        if (string != nil)
        {
            result = YES;
        }
    }
    return result;
}

4.時間戳轉(zhuǎn)時間

+(NSString *)timeConversionWithTimeStamp:(NSString *)timeStamp
{
    NSString *latestMessageTime = @"";
    double timeInterval = [timeStamp doubleValue];
    if(timeInterval > 140000000000) {
        timeInterval = timeInterval / 1000;
    }
    NSDateFormatter* formatter = [[NSDateFormatter alloc]init];
    [formatter setDateFormat:@"YYYY-MM-dd hh:mm:ss"];
    latestMessageTime = [formatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:timeInterval]];
 }

5.截圖

/**
 *  截圖
 *
 *  @param view 需要截取的視圖
 *
 *  @return 截圖 圖片
 */
+ (UIImage *)screenShotFormView:(UIView *)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, [UIScreen mainScreen].scale);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

6.圖片設置圓角

/**
 *  圖片設置圓角
 *
 *  @param cornerRadius 圓角值
 *  @param image     圖片
 *
 *  @return 圓角圖片
 */
- (UIImage *)imageWithCornerRadius:(CGFloat)cornerRadius image:(UIImage *)image
{
    CGRect frame = CGRectMake(0, 0, image.size.width, image.size.height);
    UIGraphicsBeginImageContextWithOptions(image.size, NO, 1.0);
    [[UIBezierPath bezierPathWithRoundedRect:frame
                                cornerRadius:cornerRadius] addClip];
    // 畫圖
    [image drawInRect:frame];
    // 獲取新的圖片
    UIImage *im = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return im;
}