objective c block callback

objective c block callback

在新的iOS API中block被大量用來取代傳統的delegate和callback,而新的API會大量使用block主要是基於以下兩個原因: 可以直接在程式碼中撰寫等會要接著執行的程式,直接將程式碼變成函數的參數傳入函數中,這是新API最常使用block的地方。

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