屏幕高度和宽度
#define KSCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define KSCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
关于获取颜色和随机色
#define JMColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
#define RandomColor [UIColor colorWithRed:arc4random_uniform(256)/255.0 green:arc4random_uniform(256)/255.0 blue:arc4random_uniform(256)/255.0 alpha:1]
