UI相关

1. button 图标和文字位置设置

//文字
button.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom;
button.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;```

//图标
[button setImage:[UIImage imageNamed:@"picture_name.png"] forState:UIControlStateNormal];
[button setImageEdgeInsets:UIEdgeInsetsMake(5, 10, 5, 65)];```

2. title的设置

self.tabBarItem.title = @"首页";  //只在没有嵌入navigation时生效
self.title = @"新闻";  //self.tabBarItem.title继承自self.title;
self.navigationItem.title = @"导航";  //如果不设置，和self.title的内容是一样的```
#####3. NavigationBar中间文字属性修改

self.navigationController.navigationBar.titleTextAttributes = @{
NSForegroundColorAttributeName : [UIColor whiteColor],
NSFontAttributeName : [UIFont boldSystemFontOfSize:16]
};

#####4. Label部分文字变色

NSString *str = @"this is a string";
NSMutableAttributedString *noteStr =
[[NSMutableAttributedString alloc] initWithString:str];
NSRange redRange = NSMakeRange(0, 20);
[noteStr addAttribute:NSForegroundColorAttributeName
value:[UIColor redColor]
range:redRange];
[label setAttributedText:noteStr];
[label sizeToFit];

#####5. UISwitch修改大小

//不能设置frame，只能用缩放比例
switch.transform = CGAffineTransformMakeScale(0.75, 0.75);

#####6. 透明NavigationBar

//写法1

• (void)viewWillAppear:(BOOL)animated
  {
  [super viewWillAppear:animated];
  [self.navigationController.navigationBar setShadowImage:[UIImage new]];
  [self.navigationController.navigationBar setBackgroundImage:[UIImage new]
  forBarMetrics:UIBarMetricsDefault];
  }
• (void)viewWillDisappear:(BOOL)animated
  {
  [super viewWillDisappear:animated];
  [self.navigationController.navigationBar setShadowImage:nil];
  [self.navigationController.navigationBar setBackgroundImage:nil
  forBarMetrics:UIBarMetricsDefault];
  }
  //写法2
• (void)setNavBarImg:(UINavigationBar *)navBar
  {
  if ([navBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)])
  {
  // if iOS 5.0 and later
  [navBar setBackgroundImage:[UIImage imageNamed:@"background_detail_bg1"]
  forBarMetrics:UIBarMetricsDefault];
  }
  else
  {
  UIImageView *imageView = (UIImageView *)[navBar viewWithTag:10];
  [imageView setBackgroundColor:[UIColor clearColor]];
  if (imageView == nil)
  {
  imageView =
  [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background_detail_bg1"]];
  [imageView setTag:10];
  [navBar insertSubview:imageView atIndex:0];
  }
  }
  }

#####7. ScrollView顶部图片下拉变大效果

//以下代码作用是图片高度改变，宽度也会改变，因此只需要修改图片高度即可
ImageView.contentMode=UIViewContentModeScaleAspectFill;