摘要： https://developer.apple.com/library/ios/documentation/CoreFoundation/Conceptual/CFDesignConcepts/Articles/tollFreeBridgedTypes.htmltoll-free bridge本质上... 阅读全文

摘要： static NSString * const testString = @"google"; //表示testString这个指针不能被修改，如若对testString赋值则会报错：testString ＝ @"hello";编译器会报错staticNSStringconst*testString... 阅读全文

摘要： - (UIImage*) drawText:(NSString*)text inImage:(UIImage*)image{ //prepare image context UIGraphicsBeginImageContext(image.size); //draw image, (画图片)... 阅读全文