摘要：获得屏幕图像,label的动态size,时间戳转化为时间,RGB转化成颜色,加边框,压缩图片,textfield的placeholder,图片做灰度处理
1.获得屏幕图像
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- (UIImage *)imageFromView: (UIView *) theView{ UIGraphicsBeginImageContext(theView.frame.size); CGContextRef context = UIGraphicsGetCurrentContext(); [theView.layer renderInContext:context]; UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return theImage;} |
2.label的动态size
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- (CGSize)labelAutoCalculateRectWith:(NSString*)text FontSize:(CGFloat)fontSize MaxSize:(CGSize)maxSize{ NSMutableParagraphStyle* paragraphStyle = [[NSMutableParagraphStyle alloc]init]; paragraphStyle.lineBreakMode=NSLineBreakByWordWrapping; NSDictionary* attributes =@{NSFontAttributeName:[UIFont fontWithName:@"MicrosoftYaHei" size:fontSize],NSParagraphStyleAttributeName:paragraphStyle.copy}; CGSize labelSize = [text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading|NSStringDrawingTruncatesLastVisibleLine attributes:attributes context:nil].size; labelSize.height=ceil(labelSize.height); return labelSize;} |
3.时间戳转化为时间
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-(NSString*)TimeTrasformWithDate:(NSString *)dateString{ NSDateFormatter *formatter = [[NSDateFormatter alloc]init]; [formatter setDateFormat:@"YY-MM-dd HH:mm"]; [formatter setTimeZone:[NSTimeZone timeZoneWithName:@"Asia/Beijing"]]; NSString *date = [formatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:dateString.integerValue]]; //NSLog(@"date1:%@",date); return date;} |
4.RGB转化成颜色
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+ (UIColor *)colorFromHexRGB:(NSString *)inColorString{ UIColor *result = nil; unsigned int colorCode = 0; unsigned char redByte, greenByte, blueByte; if (nil != inColorString) { NSScanner *scanner = [NSScanner scannerWithString:inColorString]; (void) [scanner scanHexInt:&colorCode]; // ignore error } redByte = (unsigned char) (colorCode >> 16); greenByte = (unsigned char) (colorCode >> 8); blueByte = (unsigned char) (colorCode); // masks off high bits result = [UIColor colorWithRed: (float)redByte / 0xff green: (float)greenByte/ 0xff blue: (float)blueByte / 0xff alpha:1.0]; return result;} |
5.加边框
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UIRectCorner corners=UIRectCornerTopLeft | UIRectCornerTopRight; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(4, 0)];CAShapeLayer *maskLayer = [CAShapeLayer layer];maskLayer.frame = view.bounds;maskLayer.path = maskPath.CGPath;view.layer.mask = maskLayer; |
6.//压缩图片
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+ (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize{ //创建一个图形上下文形象 UIGraphicsBeginImageContext(newSize); // 告诉旧图片画在这个新的环境,所需的 // new size [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)]; //获取上下文的新形象 UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext(); // 结束上下文 UIGraphicsEndImageContext(); return newImage;} |
7.textfield的placeholder
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[textF setValue:[UIColor whiteColor] forKeyPath:@"_placeholderLabel.textColor"];[textF setValue:[UIFont boldSystemFontOfSize:15] forKeyPath:@"_placeholderLabel.font"]; |
8.布局
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butLeft. imageEdgeInsets = UIEdgeInsetsMake (7 , 5 , 7 , 25 );butLeft.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter; |
9.//调用此方法改变label最后2个字符的大小
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- (void)label:(UILabel *)label BehindTextSize:(NSInteger)integer{ NSMutableAttributedString *mutaString = [[NSMutableAttributedString alloc] initWithString:label.text]; [mutaString addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:16] range:NSMakeRange(label.text.length-2, 2)]; label.attributedText = mutaString;} |
10.
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- (void)ChangeLabelTextColor:(UILabel *)label{ NSMutableAttributedString *mutaString = [[NSMutableAttributedString alloc] initWithString:label.text]; [mutaString addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:207/255.0 green:34/255.0 blue:42/255.0 alpha:1] range:NSMakeRange(0, 5)]; label.attributedText = mutaString;} |
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if ([tableView respondsToSelector:@selector(setSeparatorInset:)]) { [tableView setSeparatorInset:UIEdgeInsetsZero]; } if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) { if ([tableView respondsToSelector:@selector(setLayoutMargins:)]) { [tableView setLayoutMargins:UIEdgeInsetsZero]; } } // Do any additional setup after loading the view.}- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{ if ([cell respondsToSelector:@selector(setSeparatorInset:)]) { [cell setSeparatorInset:UIEdgeInsetsZero]; } if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) { if ([cell respondsToSelector:@selector(setLayoutMargins:)]) { [cell setLayoutMargins:UIEdgeInsetsZero]; } } } |
11.图片变灰度
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-(UIImage *) grayscaleImage: (UIImage *) image{ CGSize size = image.size; CGRect rect = CGRectMake(0.0f, 0.0f, image.size.width, image.size.height); // Create a mono/gray color space CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); CGContextRef context = CGBitmapContextCreate(nil, size.width, size.height, 8, 0, colorSpace, kCGImageAlphaNone); CGColorSpaceRelease(colorSpace); // Draw the image into the grayscale context CGContextDrawImage(context, rect, [image CGImage]); CGImageRef grayscale = CGBitmapContextCreateImage(context); CGContextRelease(context); // Recover the image UIImage *img = [UIImage imageWithCGImage:grayscale]; CFRelease(grayscale); return img;} |
13.16进制转rgb
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#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0] |
以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持服务器之家！
原文链接：http://blog.csdn.net/ws1352864983/article/details/51131276
