iOS--喜闻乐见④

• Plain类型TableView的HeaderView和FooterView不停靠上下边缘
  大家都知道Plain的tableView头尾视图会附着在上下边缘，现在我不想让它附着了（去掉黏性），方法如下①:
  自定义HeaderView.h：

HeaderView.m

自定义FooterView.h

FooterView.m

使用：

方法②
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat sectionHeaderHeight = 5;
if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0)
{
scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
}
else if (scrollView.contentOffset.y>=sectionHeaderHeight)
{
scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);
}
}

• 十六进制数字转颜色
  + (UIColor *)colorWithHexString:(NSString *)hexString {
  unsigned int red,green,blue;
  NSRange range;
  range.length = 2;
  range.location = 0;
  [[NSScanner scannerWithString:[hexString substringWithRange:range]]scanHexInt:&red];
  range.location = 2;
  [[NSScanner scannerWithString:[hexString substringWithRange:range]]scanHexInt:&green];
  range.location = 4;
  [[NSScanner scannerWithString:[hexString substringWithRange:range]]scanHexInt:&blue];
  return [UIColor colorWithRed:(float)(red/255.0f)green:(float)(green / 255.0f) blue:(float)(blue / 255.0f)alpha:1.0f];
  }

• 星星评分（传参型,支持NIB和代码）
  StarView.h
  

  StarView.png
  StarView.m
  - (instancetype) initWithFrame:(CGRect)frame {
  self = [super initWithFrame:frame];
  if (self) {
  self.backgroundColor = [UIColor clearColor];//主背景颜色为透明
  [self _creatView];
  }
  return self;
  }
  - (void)awakeFromNib {
  [super awakeFromNib];
  self.backgroundColor = [UIColor clearColor];//主背景颜色为透明
  [self _creatView];
  }
  - (void)_creatView {
  //创建灰黄星星
  UIImage *yellowImg = [UIImage imageNamed:@"StarsForeground"];//灰星星图片
  UIImage *grayImg = [UIImage imageNamed:@"StarsBackground"];//黄星星图片
  _grayView = [[UIView alloc]initWithFrame:CGRectMake(0.f, 0.f, grayImg.size.width * 5.f, grayImg.size.height)];//灰星星图片frame
  _grayView.backgroundColor = [UIColor colorWithPatternImage:grayImg];//灰星星图片背景颜色
  [self addSubview:_grayView];//加载灰星星图片
  _yellowView= [[UIView alloc]initWithFrame:CGRectMake(0.f, 0.f, yellowImg.size.width * 5.f, yellowImg.size.height)];//黄星星图片frame
  _yellowView.backgroundColor = [UIColor colorWithPatternImage:yellowImg];//黄星星图片背景颜色
  [self addSubview:_yellowView];//加载黄星星图片
  // 计算缩放倍数
  CGFloat scale = self.frame.size.height / yellowImg.size.height;
  //放大倍数
  CGAffineTransform t = CGAffineTransformMakeScale(scale, scale);//高宽同比例缩放
  _grayView.transform = t;
  _yellowView.transform = t;
  //星星视图修改transform后，坐标会被改变，重新恢复坐标
  _yellowView.origin = CGPointZero;
  _grayView.origin = CGPointZero;
  }
  - (void)setRating:(CGFloat)rating {
  if (_rating != rating) {
  _rating = rating;
  CGFloat s = [self backFloatWithRatingFloat:_rating];
  CGFloat yellowWidth = s * self.frame.size.width;
  _yellowView.width = yellowWidth;//将比例后宽度设置为黄星星宽度
  }
  }
  //大于等于N.5的按N+1算，小于N.f按大于N按N.5算，等于N按N算（0 < N <5）
  - (CGFloat) backFloatWithRatingFloat:(CGFloat)ratingFloat {
  if (ratingFloat == floorf(ratingFloat)) {
  return floorf(ratingFloat) / 5.f;
  }else if (ratingFloat > floorf(ratingFloat) && ratingFloat <= (floorf(ratingFloat) + 0.5)) {
  return (floorf(ratingFloat) + 0.5f) / 5.f;
  }else {
  return (floorf(ratingFloat) + 1.f) / 5.f;
  }
  }
  - (void)layoutSubviews {
  [super layoutSubviews];
  //创建灰黄星星
  UIImage *yellowImg = [UIImage imageNamed:@"StarsForeground"];//灰星星图片
  UIImage *grayImg = [UIImage imageNamed:@"StarsBackground"];//黄星星图片
  _grayView.backgroundColor = [UIColor colorWithPatternImage:grayImg];//灰星星图片背景颜色
  _yellowView.backgroundColor = [UIColor colorWithPatternImage:yellowImg];//黄星星图片背景颜色
  }

PS：评分为五星满分，可自行修改成自己的需求（backFloatWithRatingFloat:）

• 查看ipa支持版本（32位，64位）
  取出ipa的执行文件，在终端输入otool -vh ipa执行文件路径

• 显示/隐藏文件
  //显示
  defaults write com.apple.finder AppleShowAllFiles -bool true
  killall Finder
  //隐藏
  defaults write com.apple.finder AppleShowAllFiles -bool false
  killall Finder

• 查看工程量
  find . -name ".m" -or -name ".h" -or -name ".xib" -or -name ".c" |xargs wc -l

• 获取iOS设备的型号
  +(NSString*)deviceString {
  struct utsname systemInfo;
  uname(&systemInfo);
  NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
  if ([deviceString isEqualToString:@"iPhone1,1"]) return @"iPhone 1G";
  if ([deviceString isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
  if ([deviceString isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
  if ([deviceString isEqualToString:@"iPhone3,1"]) return @"iPhone 4 GSM";
  if ([deviceString isEqualToString:@"iPhone3,2"]) return @"iPhone 4 WCDMA";
  if ([deviceString isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";
  if ([deviceString isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";
  if ([deviceString isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";
  if ([deviceString isEqualToString:@"iPod4,1"]) return @"iPod Touch 4G";
  if ([deviceString isEqualToString:@"iPad1,1"]) return @"iPad";
  if ([deviceString isEqualToString:@"iPad2,1"]) return @"iPad 2 (WiFi)";
  if ([deviceString isEqualToString:@"iPad2,2"]) return @"iPad 2 (GSM)";
  if ([deviceString isEqualToString:@"iPad2,3"]) return @"iPad 2 (CDMA)";
  if ([deviceString isEqualToString:@"i386"]) return @"Simulator";
  if ([deviceString isEqualToString:@"x86_64"]) return @"Simulator";
  NSLog(@"NOTE: Unknown device type: %@", deviceString); return deviceString;
  }
  //获取系统版本
  NSLog([[UIDevice currentDevice] name]); // Name of the phone as named by u
  NSLog([[UIDevice currentDevice] uniqueIdentifier]); // A GUID like string
  NSLog([[UIDevice currentDevice] systemName]); // "iPhone OS"
  NSLog([[UIDevice currentDevice] systemVersion]); // "2.2.1"
  NSLog([[UIDevice currentDevice] model]); // "iPhone" on both devices
  NSLog([[UIDevice currentDevice] localizedModel]); // "iPhone" on both devices
  float version = [[[UIDevice currentDevice] systemVersion] floatValue];

补全