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UITextField、UITextView限制字符串输入长度

UITextRange *selectedRange = [textView markedTextRange];//获取高亮部分UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];//如果在变化中是高亮部分在变，就不要计算字符了if (selectedRange && pos) {return;}...

// 通过runtime获取UITextView所有的属性和变量// unsigned int count = 0;// Ivar *ivarList = class_copyIvarList(objc_getClass("UITextView"), &count); UILabel *label = [UILabel new];; label.text = placeHolder; label.font = self.font; label.text