UIImageC处理

UIImageC处理

1、等比缩放

1. - (UIImage *) scaleImage:(UIImage *)image toScale:(float)scaleSize {
2. UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize);
3. [image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];
4. UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
5. UIGraphicsEndImageContext();
6. return scaledImage;
7. }

2、自定义大小

1. - (UIImage *) reSizeImage:(UIImage *)image toSize:(CGSize)reSize {
2. UIGraphicsBeginImageContext(CGSizeMake(reSize.width, reSize.height));
3. [image drawInRect:CGRectMake(0, 0, reSize.width, reSize.height)];
4. UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext();
5. UIGraphicsEndImageContext();
6. return reSizeImage;
7. }

3、处理某个特定的view

只要是继承UIView的object 都可以处理
     必须先import QuzrtzCore.framework

1. -(UIImage*) captureView:(UIView *)theView {
2. CGRect rect = theView.frame;
3. UIGraphicsBeginImageContext(rect.size);
4. CGContextRef context = UIGraphicsGetCurrentContext();
5. [theView.layer renderInContext:context];
6. UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
7. UIGraphicsEndImageContext();
8. return img;
9. }

4、存储图片

4.1、存储到app的文件里

把要处理的图片以image.png的名字存储到app home地下的Document目录中

1. NSString *path = [[NSHomeDirectory()stringByAppendingPathComponent:@"Documents"]stringByAppendingPathComponent:@"image.png"];
2. [UIImagePNGRepresentation(image) writeToFile:pathatomically:YES];

4.2、存储到手机的图片库中

1. CGImageRef screen = UIGetScreenImage();
2. UIImage* image = [UIImage imageWithCGImage:screen];
3. CGImageRelease(screen);
4. UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);

获取当前app的名称和版本号

1. NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
2. // app名称
3. NSString *name = [infoDictionary objectForKey:@"CFBundleDisplayName"];
4. // app版本
5. NSString *version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
6. // app build版本
7. NSString *build = [infoDictionary objectForKey:@"CFBundleVersion"];

UILabel根据text自动调整大小

1. label.text = @"**********";
2. CGRect frame = label.frame;
3. frame.size.height = 10000;  // 设置一个很大的高度
4. label.frame = frame;
5. [label sizeToFit];
6. frame.size.height = label.frame.size.height;
7. label.frame = frame;

直接拨打有分机号的电话

1. [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://01011112222,3333"]];

参考：http://apluck.iteye.com/blog/1418640#