UILabel设置
@property(nonatomic,copy)NSString *text;//显示文字
@property(nonatomic,retain)UIFont *font;//字体
@property(nonatomic,retain)UIColor *textColor;//文字颜色
@property(nonatomic)NSTextAlignment textAlignment;//对齐模式（左对齐，居中对齐，右对齐）
UIFont代表字体，常见的创建方法
+(UIFont *)systemFontOfSize:(CGFloat)fontSize;//系统默认字体
+(UIFont *)boldSystemFontOfSize:(CGFloat)fontsize;//粗体
+(UIFont *)italicSystemFontOfSize:(CGFloat)fontSize;//斜体
UIButton的常见设置
-(void)setTitle:(NSString *)title forState:(UIControlState)state;//设置按钮的文字
-(void)setTitleColor:(UIColor *)color forState:(UIControlState)state;//设置按钮的颜色
-(void)setImage:(UIImage *)image forState:(UIControlState)state;//设置按钮内的小图片
-(voif)setBackgroundImag:(UIImage *)image forState:(UIControlState)state;//设置按钮的背景图片
设置按钮的文字字体 （需要拿到按钮内部的label来设置）
btn.titleLabel.font = [UIFont systemFontOfSize:12];
-(NSString *)titleForState:(UIControlState)state;//获得按钮的文字
-(UIColor *)titleColorForState:(UIControlState)state;//获得按钮多文字颜色
-(UIImage *)imageForState:(UIControlState)state;//获得按钮内部的小图片
-(UIImage *)backgroundImageForState:(UIControlState)state;//获得按钮的背景图片