UITextfield 关闭联想，首字母大写

@property(nonatomic) UITextAutocapitalizationType autocapitalizationType; // default is UITextAutocapitalizationTypeSentences

@property(nonatomic) UITextAutocorrectionType autocorrectionType;         // default is UITextAutocorrectionTypeDefault

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原文地址：https://www.cnblogs.com/ldc529/p/3844209.html