设置UIButton中的文字和图片，设置UILabel的文在显示不同颜色

UIButton：

UIEdgeInsets

typedef struct UIEdgeInsets { 
CGFloat top, left, bottom, right;  // specify amount to inset (positive) for each of the edges. values can be negative to 'outset'  } UIEdgeInsets;

在UIButton中有三个对EdgeInsets的设置：ContentEdgeInsets、titleEdgeInsets、imageEdgeInsets

@property(nonatomic)          UIEdgeInsets titleEdgeInsets;                // default is UIEdgeInsetsZero
@property(nonatomic)          BOOL         reversesTitleShadowWhenHighlighted; // default is NO. if YES, shadow reverses
to shift between engrave and emboss appearance
@property(nonatomic)          UIEdgeInsets imageEdgeInsets;                // default is UIEdgeInsetsZero</span>

UIEdgeInsetsMake

里面的四个参数表示距离上边界、左边界、下边界、右边界的距离，默认都为零，title／image在button的正中央

    UIEdgeInsets insets = {top, left, bottom, right};
    return insets;
}
self.view.backgroundColor = [UIColor blackColor];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];//button的类型
    button.frame = CGRectMake(100, 100,90, 90);//button的frame
   button.backgroundColor = [UIColor cyanColor];//button的背景颜色

//    [button setBackgroundImage:[UIImage imageNamed:@"man_64.png"] forState:UIControlStateNormal];

//    在UIButton中有三个对EdgeInsets的设置：ContentEdgeInsets、titleEdgeInsets、imageEdgeInsets
    [button setImage:[UIImage imageNamed:@"[email protected]"] forState:UIControlStateNormal];//给button添加image
    button.imageEdgeInsets = UIEdgeInsetsMake(5,13,21,button.titleLabel.bounds.size.width);
//设置image在button上的位置（上top，左left，下bottom，右right）这里可以写负值，对上写－5，那么image就象上移动5个像素

    [button setTitle:@"首页" forState:UIControlStateNormal];//设置button的title
    button.titleLabel.font = [UIFont systemFontOfSize:16];//title字体大小
    button.titleLabel.textAlignment = NSTextAlignmentCenter;//设置title的字体居中
    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];//设置title在一般情况下为白色字体
    [button setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];//设置title在button被选中情况下为灰色字体
     button.titleEdgeInsets = UIEdgeInsetsMake(71, -button.titleLabel.bounds.size.width-50, 0, 0);
//设置title在button上的位置（上top，左left，下bottom，右right）

//    [button setContentEdgeInsets:UIEdgeInsetsMake(70, 0, 0, 0)];//

//   button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
//设置button的内容横向居中。。设置content是title和image一起变化，这个效果好像并不是很好，还是设置数字比较保险
    [button addTarget:self action:@selector(tap) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
</span>

//button相应的事件

    NSLog(@"tap a button");

    UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:@"hello" message:@"willingseal" delegate:self cancelButtonTitle:@"ok" otherButtonTitles: nil nil];
    [alertView show];
}
UILabel：
在一个UILabel中显示不同颜色的字
UILabel *agrreeLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 297, self.view.frame.size.width - 20*2, 30)];
    [self.view addSubview:agrreeLabel];
    //
    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"注册即表示同意某某某用户协议及隐私政策"];
//添加不同颜色的方法
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(0,7)];
//第一个参数表示从哪个位置开始，第二个参数表示包含字符的数量。
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(7,12)];
    //[str addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(19,6)];
//添加不同的字体与上面方法一样
    //[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial-BoldItalicMT" size:30.0] range:NSMakeRange(0, 5)];
    //[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Bold" size:30.0] range:NSMakeRange(6, 12)];
    //[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Courier-BoldOblique" size:30.0] range:NSMakeRange(19, 6)];
    agrreeLabel.attributedText = str;

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