图片缩放相关

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

C代码  收藏代码
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
C代码  收藏代码
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




C代码  收藏代码
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;