iphone - CIFilter filterWithName:keysAndValues: 从 NSDictionary 设置 keysAndValues

Question

嗨，我正在尝试做这样的事情：

NSMutableDictionary *param1 = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"inputIntensity", [NSNumber numberWithFloat:0.8], nil];
[param1 setObject:file forKey:kCIInputImageKey];
CIFilter *filter = [CIFilter filterWithName:@"CISepiaTone" keysAndValues:param1];

显然它不起作用，那么，如何从已经存在的字典中填充 keysAndValues 呢？谢谢！

Answer 1

[filter setValue:value forKey:key]您应该使用最简单的构造方法 (filterWithName:) 并通过迭代现有字典的键来填充值。它只需要几行代码。

Answer 2

你可以像这样使用字典：

 NSMutableDictionary *param = [NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:0.8],@"inputIntensity",imageView.image,@"inputImage",nil]

 CIFilter *filter = [CIFilter filterWithName:@"CISepiaTone" keysAndValues:@"inputImage",[param objectForKey:@"inputImage"],@"inputIntensity",[param objectForKey:@"inputIntensity",nil]];