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我正在尝试将我的代码转换为iOS 8项目,我需要一些解释如何修复此警告: "Convenience initializer missing a 'self' call to another initializer"

在这段代码上:

-(instancetype) initWithCoder:(NSCoder *)aDecoder // warning: Convenience initializer missing a 'self ' call to another initializer
{
    if (self = [super initWithCoder:aDecoder]) // warning: convenience initializer should not invoke an initializer on 'super'
    {
    // some init stuff here
    }
    return self;
}