iphone - CIFilter filterWithName :keysAndValues: set keysAndValues from NSDictionary

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，如何从一个已经存在的字典中填充 keysAndValues 呢？谢谢!

Answer 1

你应该使用最简单的构造方法(filterWithName:)并用[filter setValue:value forKey:key] 遍历现有字典的键来填充值。它只需要几行代码。