AllInOrNothing的专栏

#import "ViewController.h"#define SCREENWIDTH [UIScreen mainScreen].bounds.size.width#define SCREENHEIGHT [UIScreen mainScreen].bounds.size.height@interface ViewController (){

/// 自定义UITextFieldclass JKTextField: UITextField{ /// 传入frame var placeholderFrame:CGRect? /// 设置placeholderframe override func placeholderRectForBounds(bounds: CGRect) -> CGRec