//文件名 UIColor+Expend.h   扩展方法
.h
@interface UIColor (Expend)


.m
//  UIColor+Expend.m
 #import "UIColor+Expend.h"
#pragma mark - 颜色转换 IOS中十六进制的颜色转换为UIColor

+ (UIColor *) colorWithHexString: (NSString *)color

self.view.backgroundColor=[UIColor  colorWithHexString:@"#EEE4D9"];

//.h 文件
@interface UnderlineButton : UIButton
+ (UnderlineButton *) underlinedButton;

  UnderlineButton   *lginBtn=[UnderlineButton  buttonWithType:UIButtonTypeCustom];