定义行时出现构建错误
let runFont : CTFontRef = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName)
错误是:无法将类型“ CFString”的值转换为预期的参数类型“ UnsafePointer”(又名“ UnsafePointer <()>”)
cocoa core-text ios quartz-core swift
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