cocoa各种图片格式转换

来源：互联网发布：汇率软件编辑：程序博客网时间：2024/05/21 07:10

具体下列格式png jpeg bmp gif tiff jpeg2000 pdf

PDF 要单独处理，其他的通过画图直接转即可。

1 画图 , 画一张红色图片

NSRect exportImageRect = NSZeroRect;

exportImageRect.size = NSMakeSize(100,100);

NSImage * result = [[[NSImage alloc] initWithSize:exportImageRect.size] autorelease];

[result lockFocus];

[[NSColor redColor] set];

[NSBezierPath fillRect:exportImageRect];

[result unlockFocus];

2，转换除开pdf

，有些格式，对应的dictionary可以设置一些参数，压缩比什么的，gif的时长，一般的只用制定格式

- (void)saveImage:(NSImage *)image atPath:(NSString *)path {

NSBitmapImageRep *newRep = [NSBitmapImageRep imageRepWithData:image.TIFFRepresentation];

NSDictionary * properties = nil;

NSBitmapImageFileType type = NSPNGFileType;

if ([self.formatPopupButton.title isEqualToString:@"PNG"]) {

type = NSPNGFileType;

} else if ([self.formatPopupButton.title isEqualToString:@"JPEG"]) {

type = NSJPEGFileType;

properties = [NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:1.0] forKey:NSImageCompressionFactor];

} else if ([self.formatPopupButton.title isEqualToString:@"BMP"]) {

type = NSBMPFileType;

} else if ([self.formatPopupButton.title isEqualToString:@"GIF"]) {

type = NSGIFFileType;

} else if ([self.formatPopupButton.title isEqualToString:@"TIFF"]) {

type = NSTIFFFileType;

} else if ([self.formatPopupButton.title isEqualToString:@"JPEG 2000"]) {

type = NSJPEG2000FileType;

}

NSData *pngData = [newRep representationUsingType:type properties:properties];

[pngData writeToFile:path atomically:YES];

}

3 ,转换成pdf

pdf一般是通过把图片设置到一个nsimageview控件里面，在从里面读pdf数据，然后写到文件

- (void)saveImageAsPDF:(NSImage *)image atPath:(NSString *)path {

NSRect frame = NSZeroRect;

frame.size = image.size;

NSImageView * imageView = [[[NSImageView alloc] initWithFrame:frame] autorelease];

[imageView setImage:image];

NSData * pdfData = [imageView dataWithPDFInsideRect:frame];

[pdfData writeToFile:path options:0 error:NULL];

}

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