iphone开发实现细节

UIImageC处理

 

1、等比缩放

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

 

2、自定义大小

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

 

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

 -(UIImage*) captureView:(UIView *)theView {
     CGRect rect = theView.frame;
     UIGraphicsBeginImageContext(rect.size);
     CGContextRef context = UIGraphicsGetCurrentContext();
     [theView.layer renderInContext:context];
     UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
     return img;
 }

 

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

 

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

    4.2、存储到手机的图片库中

 CGImageRef screen = UIGetScreenImage();
 UIImage* image = [UIImage imageWithCGImage:screen];
 CGImageRelease(screen);
 UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);

 

 

 

获取当前app的名称和版本号

 

 

 

 NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
 // app名称
 NSString *name = [infoDictionary objectForKey:@"CFBundleDisplayName"];
 // app版本
 NSString *version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
 // app build版本
 NSString *build = [infoDictionary objectForKey:@"CFBundleVersion"];

 

 

 

UILabel根据text自动调整大小

 

 

 label.text = @"**********";
 CGRect frame = label.frame;
 frame.size.height = 10000;  // 设置一个很大的高度
 label.frame = frame;
 [label sizeToFit];
 frame.size.height = label.frame.size.height;
 label.frame = frame;

 

 

 

 

直接拨打有分机号的电话

 

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