ios 开发中常用的方法(计算文本，正则表达式，图片压缩，视图变化等)

#pragma mark - 计算label可以显示多少个字数

+ (NSInteger)numberOfStringInUpper:(UILabel *)label stringToSeperate:(NSString *)str{    CGRect container = label.frame;    CGSize detailSize;    for (int i = 0; i < [str length]; i ++) {        NSString *textStr = [str substringToIndex:i+1];        NSDictionary *attribute = @{NSFontAttributeName: label.font};        detailSize = [textStr boundingRectWithSize:CGSizeMake(container.size.width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading  attributes:attribute context:nil].size;                if (detailSize.height > container.size.height) {            return i;        }    }    container.size.height = detailSize.height;    [label setFrame:container]; //调整高度    return [str length];}

#pragma mark - 计算文本宽高 -

- (CGSize)getContentStr:(NSString *)text widthSize:(CGFloat)width heightSize:(CGFloat)height FontOfSize:(UIFont *)fontSize

{

CGSize requiredSize;

CGRect rect = [text boundingRectWithSize:CGSizeMake(width, height)

options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading

attributes:@{NSFontAttributeName:fontSize}

context:nil];

requiredSize = rect.size;

return requiredSize;

}

#pragma mark - 当前视图大小变化

+ (CAAnimation *)starTimer:(CGFloat)duration original:(CGFloat)original midNumerical:(CGFloat)midNumerical endNumerical:(CGFloat)endNumerical

{

CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];

animation.values = @[[NSNumber numberWithFloat:original], [NSNumber numberWithFloat:midNumerical], [NSNumber numberWithFloat:endNumerical]];//大小变化倍数

animation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

/*

速度控制函数(CAMediaTimingFunction)

kCAMediaTimingFunctionLinear（线性）：匀速，给你一个相对静态的感觉

kCAMediaTimingFunctionEaseIn（渐进）：动画缓慢进入，然后加速离开

kCAMediaTimingFunctionEaseOut（渐出）：动画全速进入，然后减速的到达目的地

kCAMediaTimingFunctionEaseInEaseOut（渐进渐出）：动画缓慢的进入，中间加速，然后减速的到达目的地。 这个是默认的动画行为。

*/

animation.duration = duration;//动画执行的时间

animation.repeatCount = HUGE_VALF;//播放次数

animation.autoreverses = NO;// 当你设定这个属性为 YES 时,在它到达目的地之后,动画的返回到开始的值,代替了直接跳转到 开始的值。

animation.removedOnCompletion = NO;//这个属性默认为 YES,那意味着,在指定的时间段完成后,动画就自动的从层上移除了。这个一般不用。假如你想要再次用这个动画时,你需要设定这个属性为 NO。这样的话,下次你在通过-set 方法设定动画的属 性时,它将再次使用你的动画,而非默认的动画

animation.fillMode=kCAFillModeForwards;

/*

fillMode的作用就是决定当前对象过了非active时间段的行为. 比如动画开始之前,动画结束之后。如果是一个动画CAAnimation,则需要将其removedOnCompletion设置为NO,要不然fillMode不起作用.

kCAFillModeRemoved 这个是默认值,也就是说当动画开始前和动画结束后,动画对layer都没有影响,动画结束后,layer会恢复到之前的状态

kCAFillModeForwards 当动画结束后,layer会一直保持着动画最后的状态

kCAFillModeBackwards 这个和kCAFillModeForwards是相对的,就是在动画开始前,你只要将动画加入了一个layer,layer便立即进入动画的初始状态并等待动画开始.你可以这样设定测试代码,将一个动画加入一个layer的时候延迟5秒执行.然后就会发现在动画没有开始的时候,只要动画被加入了layer,layer便处于动画初始状态

kCAFillModeBoth 理解了上面两个,这个就很好理解了,这个其实就是上面两个的合成.动画加入后开始之前,layer便处于动画初始状态,动画结束后layer保持动画最后的状态.

*/

return animation;

}

#pragma mark - 当前视图透明度变化

+ (CAAnimation *)fadeInOutAnimation:(CGFloat)duration fromValue:(CGFloat)fromValue toValue:(CGFloat)toValue

{

//通过keypath创建路径

CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"opacity"];

animation.duration = duration;

animation.repeatCount = HUGE_VALF;

animation.fromValue = [NSNumber numberWithFloat:fromValue];

animation.toValue = [NSNumber numberWithFloat:toValue];

animation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];

animation.autoreverses = NO;

animation.removedOnCompletion=NO;

animation.fillMode=kCAFillModeForwards;

return animation;

}

#pragma mark - 截取全屏

- (UIImage *)imageFromView:(UIView*)theView

{

UIGraphicsBeginImageContext(theView.frame.size);

CGContextRef context = UIGraphicsGetCurrentContext();

[theView.layer renderInContext:context];

UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return theImage;

}

#pragma mark - 数组排序

- (NSArray *)getSortingArray:(NSArray *)array{

// 返回一个排好序的数组，原来数组的元素顺序不会改变

// 指定元素的比较方法：compare:

NSArray *array2 = [array sortedArrayUsingSelector:@selector(compare:)];

return array2;

}

#pragma mark - 点赞效果 大小变化

- (void)imageViewAnimationLayer:(UIView *)view{

CAKeyframeAnimation *k = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];

k.values = @[@(0.1),@(1.0),@(1.2)];

k.keyTimes = @[@(0.0),@(0.5),@(0.8),@(1.0)];

k.calculationMode = kCAAnimationLinear;

[view.layer addAnimation:k forKey:@"trans"];

}

#pragma mark - 获取当前时间

+ (NSString *)getCurrentTime{

//现在时间

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSString *currentTime = [NSString stringWithFormat:@"%@",[formatter stringFromDate:[NSDate date]]];

formatter = nil;

return currentTime;

}

#pragma mark 图片压缩

+ (UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize withImage:(UIImage*)selectedImage

{

//方法2

CGFloat scaxy=1.0;

const int maxW = targetSize.width, maxH = targetSize.height;

if (selectedImage.size.height>maxH && selectedImage.size.width >maxW)

{

CGFloat scax = maxH/selectedImage.size.width;

CGFloat scay = maxW/selectedImage.size.height;

if (scax > scay)

{

scaxy = scay;

}

else

{

scaxy = scax;

}

}

UIGraphicsBeginImageContext(CGSizeMake(selectedImage.size.width * scaxy, selectedImage.size.height *scaxy));

// Tell the old image to draw in this new context, with the desired// new size

[selectedImage drawInRect:CGRectMake(0,0,selectedImage.size.width * scaxy, selectedImage.size.height *scaxy)];

UIImage    *newImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return newImage;

}

#pragma mark - 随机颜色

+(UIColor *)randomColor:(CGFloat)alpha

{

CGFloat red = arc4random_uniform(253);

CGFloat green = arc4random_uniform(254);

CGFloat blue = arc4random_uniform(255);

//    CGFloat red = arc4random() % 256 ;//(CGFloat)random()/(CGFloat)RAND_MAX;

//    CGFloat green =arc4random() % 256 ; //(CGFloat)random()/(CGFloat)RAND_MAX;

//    CGFloat blue = arc4random() % 256 ;//(CGFloat)random()/(CGFloat)RAND_MAX;

return [UIColor colorWithRed:red/255.0f green:green/255.0f blue:blue/255.0f alpha:alpha];

}

// 正则判断电话号码地址格式,固话

+(BOOL)isTelePhone:(NSString *)telePhoneNum

{

/**

* 手机号码

* 移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188

* 联通：130,131,132,152,155,156,185,186

* 电信：133,1349,153,180,189

*/

NSString * MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";

/**

10        * 中国移动：China Mobile

11        * 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188

12        */

NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";

/**

15        * 中国联通：China Unicom

16        * 130,131,132,152,155,156,185,186

17        */

NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";

/**

20        * 中国电信：China Telecom

21        * 133,1349,153,180,189

22        */

NSString * CT = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";

/**

25        * 大陆地区固话及小灵通

26        * 区号：010,020,021,022,023,024,025,027,028,029

27        * 号码：七位或八位

28        */

//    NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";

NSString * PHS = @"^((\\d{7,8})|(\\d{4}|\\d{3})-(\\d{7,8})|(\\d{4}|\\d{3})-(\\d{7,8})-(\\d{4}|\\d{3}|\\d{2}|\\d{1})|(\\d{7,8})-(\\d{4}|\\d{3}|\\d{2}|\\d{1}))$";

//    NSString * PHS = @"^(\\b0[1-2]\\d-\\d{8}(-\\d{1,4})?\\b)|(\\b0\\d{3}-\\d{7,8}(-\\d{1,4})?\\b)$";

//    NSString * PHS = @"^(0?1[358]\\d{9})|((0(10|2[1-3]|[3-9]\\d{2}))?[1-9]\\d{6,7})$";

NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];

NSPredicate *regextestphs = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", PHS];

NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];

NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];

NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];

if (([regextestmobile evaluateWithObject:telePhoneNum] == YES)

||([regextestphs evaluateWithObject:telePhoneNum] == YES)

|| ([regextestcm evaluateWithObject:telePhoneNum] == YES)

|| ([regextestct evaluateWithObject:telePhoneNum] == YES)

|| ([regextestcu evaluateWithObject:telePhoneNum] == YES))

{

return YES;

}

else

{

return NO;

}

}

//判断是否中文

+ (BOOL)isChinese:(NSString *)string{

NSString *miaoNumRegex =@"^[\u4e00-\u9fa5]{0,}$";

NSPredicate *passTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",miaoNumRegex];

return [passTest evaluateWithObject:string];

}

#pragma mark - 计算文本宽高 -

//+(CGSize)getSize:(NSString *)str widthSize:(CGFloat)width FontOfSize:(CGFloat)fontSize

//{

//    CGSize requiredSize;

//    if ([str respondsToSelector:@selector(boundingRectWithSize:options:attributes:context:)]) {

//        CGRect rect = [str boundingRectWithSize:(CGSize){width, MAXFLOAT}

//                                        options:NSStringDrawingUsesLineFragmentOrigin

//                                    attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:fontSize]}

//                                        context:nil];

//        requiredSize = rect.size;

//

//    } else {

//

//        requiredSize = [str sizeWithFont:[UIFont systemFontOfSize:fontSize] constrainedToSize:(CGSize){width, MAXFLOAT} lineBreakMode:NSLineBreakByWordWrapping];

//    }

//

//    return requiredSize;

//}

//+(CGSize)getSize:(NSString *)str widthSize:(CGFloat)width FontOfBSize:(CGFloat)fontSize

//{

//    CGSize requiredSize;

//    if ([str respondsToSelector:@selector(boundingRectWithSize:options:attributes:context:)]) {

//        CGRect rect = [str boundingRectWithSize:(CGSize){width, MAXFLOAT}

//                                        options:NSStringDrawingUsesLineFragmentOrigin

//                                    attributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:fontSize]}

//                                        context:nil];

//        requiredSize = rect.size;

//

//    } else {

//

//        requiredSize = [str sizeWithFont:[UIFont boldSystemFontOfSize:fontSize] constrainedToSize:(CGSize){width, MAXFLOAT} lineBreakMode:NSLineBreakByWordWrapping];

//    }

//

//    return requiredSize;

//}

//身份证号

+ (BOOL)validateIdentityCard: (NSString *)identityCard

{

BOOL flag;

if (identityCard.length <= 0) {

flag = NO;

return flag;

}

NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";

NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];

return [identityCardPredicate evaluateWithObject:identityCard];

}

// 判断邮箱是否正确

+ (BOOL)isValidateEmail:(NSString *)Email

{

NSString *emailCheck = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailCheck];

return [emailTest evaluateWithObject:Email];

}

//判断字母数字

+ (BOOL)IsNumber:(NSString *)number

{

//是否字母数字

NSString *miaoNumRegex =@"^[a-zA-Z0-9_]+$";

NSPredicate *passTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",miaoNumRegex];

return [passTest evaluateWithObject:number];

}

//#pragma mark 图片压缩

//+ (UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize withImage:(UIImage*)selectedImage

//{

//    //方法1

////    CGFloat scaxy=1.0;

////    CGSize imageSize = selectedImage.size;

////    CGFloat targetWidth = targetSize.width;

////    CGFloat targetHeight = targetSize.height;

////

////    if (CGSizeEqualToSize(imageSize, targetSize) == NO)

////    {

////        CGFloat scax = targetWidth / imageSize.width;

////        CGFloat scay =  targetHeight / imageSize.height;

////        if (scax > scay)

////        {

////            scaxy = scay;

////        }

////        else

////        {

////            scaxy = scax;

////        }

////    }

////

////    CGFloat scaledWidth = selectedImage.size.width * scaxy;

////    CGFloat scaledHeight = selectedImage.size.height *scaxy;

////

//////    UIGraphicsBeginImageContext(CGSizeMake(selectedImage.size.width * scaxy, selectedImage.size.height *scaxy));

////    UIGraphicsBeginImageContext(CGSizeMake(scaledWidth, scaledHeight));

////    // Tell the old image to draw in this new context, with the desired// new size

//////    [selectedImage drawInRect:CGRectMake(0,0,selectedImage.size.width * scaxy, selectedImage.size.height *scaxy)];

////

////    CGRect thumbnailRect = CGRectZero;

////    thumbnailRect.origin = CGPointMake(0.0, 0.0);

////    thumbnailRect.size.width = scaledWidth;

////    thumbnailRect.size.height = scaledHeight;

////

////    CGContextRef context = UIGraphicsGetCurrentContext();

////    CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);

////    UIRectFill(CGRectMake(0, 0, targetWidth, targetHeight));//clear background

////

////    [selectedImage drawInRect:thumbnailRect];

////

////    UIImage    *newImage = UIGraphicsGetImageFromCurrentImageContext();

////    UIGraphicsEndImageContext();

//

//    //方法2

//        CGFloat scaxy=1.0;

//        const int maxW = targetSize.width, maxH = targetSize.height;

//        if (selectedImage.size.height>maxH && selectedImage.size.width >maxW)

//        {

//            CGFloat scax = maxH/selectedImage.size.width;

//            CGFloat scay = maxW/selectedImage.size.height;

//            if (scax > scay)

//            {

//                scaxy = scay;

//            }

//            else

//            {

//                scaxy = scax;

//            }

//        }

//        UIGraphicsBeginImageContext(CGSizeMake(selectedImage.size.width * scaxy, selectedImage.size.height *scaxy));

//        // Tell the old image to draw in this new context, with the desired// new size

//        [selectedImage drawInRect:CGRectMake(0,0,selectedImage.size.width * scaxy, selectedImage.size.height *scaxy)];

//        UIImage    *newImage = UIGraphicsGetImageFromCurrentImageContext();

//        UIGraphicsEndImageContext();

//

////  方法3

////    //    UIImage *selectedImage = self;

////    UIImage *newImage = nil;

////    CGSize imageSize = selectedImage.size;

////    CGFloat width = imageSize.width;

////    CGFloat height = imageSize.height;

////    CGFloat targetWidth = targetSize.width;

////    CGFloat targetHeight = targetSize.height;

////    CGFloat scaleFactor = 0.0;

////    CGFloat scaledWidth = targetWidth;

////    CGFloat scaledHeight = targetHeight;

//////    CGPoint thumbnailPoint = CGPointMake(0.0,0.0);

////

////    if (CGSizeEqualToSize(imageSize, targetSize) == NO)

////    {

////        CGFloat widthFactor = targetWidth / width;

////        CGFloat heightFactor = targetHeight / height;

////

////        if (widthFactor > heightFactor)

////            scaleFactor = widthFactor; // scale to fit height

////        else

////            scaleFactor = heightFactor; // scale to fit width

////        scaledWidth  = width * scaleFactor;

////        scaledHeight = height * scaleFactor;

////

////        // center the image 裁剪中间

//////        if (widthFactor > heightFactor)

//////        {

//////            thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;

//////        }

//////        else

//////            if (widthFactor < heightFactor)

//////            {

//////                thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;

//////            }

////    }

////

//////    UIGraphicsBeginImageContext(targetSize); // this will crop

////    UIGraphicsBeginImageContext(CGSizeMake(scaledWidth, scaledHeight)); // this will crop

////

////    CGRect thumbnailRect = CGRectZero;

//////    thumbnailRect.origin = thumbnailPoint;

////    thumbnailRect.size.width  = scaledWidth;

////    thumbnailRect.size.height = scaledHeight;

////

////    [selectedImage drawInRect:thumbnailRect];

////

////    newImage = UIGraphicsGetImageFromCurrentImageContext();

////    if(newImage == nil)

////        NSLog(@"could not scale image");

////

////    //pop the context to get back to the default

////    UIGraphicsEndImageContext();

//    return newImage;

//}

//

//+(UIImage *)scaleAndRotateImage:(UIImage *)image resolution:(int)kMaxResolution{

//    CGImageRef imgRef = image.CGImage;

//    CGFloat width = CGImageGetWidth(imgRef);

//    CGFloat height = CGImageGetHeight(imgRef);

//

//    CGAffineTransform transform = CGAffineTransformIdentity;

//    CGRect bounds = CGRectMake(0, 0, width, height);

//    if (width > kMaxResolution || height > kMaxResolution) {

//        CGFloat ratio = width/height;

//        if (ratio > 1) {

//            bounds.size.width = kMaxResolution;

//            bounds.size.height = bounds.size.width / ratio;

//        } else {

//            bounds.size.height = kMaxResolution;

//            bounds.size.width = bounds.size.height * ratio;

//        }

//    }

//

//    CGFloat scaleRatio = bounds.size.width / width;

//    CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));

//    CGFloat boundHeight;

//

//    UIImageOrientation orient = image.imageOrientation;

//    switch(orient) {

//        case UIImageOrientationUp:

//            transform = CGAffineTransformIdentity;

//            break;

//        case UIImageOrientationUpMirrored:

//            transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);

//            transform = CGAffineTransformScale(transform, -1.0, 1.0);

//            break;

//        case UIImageOrientationDown:

//            transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);

//            transform = CGAffineTransformRotate(transform, M_PI);

//            break;

//        case UIImageOrientationDownMirrored:

//            transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);

//            transform = CGAffineTransformScale(transform, 1.0, -1.0);

//            break;

//        case UIImageOrientationLeftMirrored:

//            boundHeight = bounds.size.height;

//            bounds.size.height = bounds.size.width;

//            bounds.size.width = boundHeight;

//            transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);

//            transform = CGAffineTransformScale(transform, -1.0, 1.0);

//            transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);

//            break;

//        case UIImageOrientationLeft:

//            boundHeight = bounds.size.height;

//            bounds.size.height = bounds.size.width;

//            bounds.size.width = boundHeight;

//            transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);

//            transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);

//            break;

//        case UIImageOrientationRightMirrored:

//            boundHeight = bounds.size.height;

//            bounds.size.height = bounds.size.width;

//            bounds.size.width = boundHeight;

//            transform = CGAffineTransformMakeScale(-1.0, 1.0);

//            transform = CGAffineTransformRotate(transform, M_PI / 2.0);

//            break;

//        case UIImageOrientationRight:

//            boundHeight = bounds.size.height;

//            bounds.size.height = bounds.size.width;

//            bounds.size.width = boundHeight;

//            transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);

//            transform = CGAffineTransformRotate(transform, M_PI / 2.0);

//            break;

//        default:

//            [NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];

//    }

//

//    UIGraphicsBeginImageContext(CGSizeMake(floorf(bounds.size.width), floorf(bounds.size.height)));

//    CGContextRef context = UIGraphicsGetCurrentContext();

//    if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {

//        CGContextScaleCTM(context, -scaleRatio, scaleRatio);

//        CGContextTranslateCTM(context, -height, 0);

//    } else {

//        CGContextScaleCTM(context, scaleRatio, -scaleRatio);

//        CGContextTranslateCTM(context, 0, -height);

//    }

//    CGContextConcatCTM(context, transform);

//

//    CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, floorf(width), floorf(height)), imgRef);

//    UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();

//    UIGraphicsEndImageContext();

//    return imageCopy;

//}