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"]];