iOS开发小技巧（收集及个人）
1. 隐藏UITableView多余cell的分割线
tableView.tableFooterView= [[UIView alloc]init];
2. 取消UINavigationController自带的返回字样
[[UIBarButtonItem appearance]setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];
3. 滑动时隐藏navigation
self.navigationController.hidesBarsOnSwipe=YES;
4. 页面跳转是隐藏tabBar
TwoViewController *twoVC = [[TwoViewController alloc] init];
twoVC.hidesBottomBarWhenPushed =YES;
5. ScrollView不能滑到顶
self.automaticallyAdjustsScrollViewInsets=NO;
6. 按钮点击发光效果
button.showsTouchWhenHighlighted =YES;
7.长按手势只执行一次
if（sender.state == UIGestureRecognizerState）
8. 隐藏状态栏
- (BOOL)prefersStatusBarHidden{
returnYES;
}
9. 在使用view的缩放的时候，layer.border.width随着view的放大，会出现锯齿化的问题。
self.layer.allowsEdgeAntialiasing = YES;
10. 自定义了leftBarbuttonItem左滑返回手势失效了怎么办?
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:img style:UIBarButtonItemStylePlain target:self action:@selector(onBack:)];self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;
11. 怎么在不新建一个Cell的情况下调整separaLine的位置?
tableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);
12. CoreData用起来好烦,语法又臭又长,怎么办?
MagicRecord
13. 本来我的statusbar是lightcontent的，结果用UIImagePickerController会导致我的statusbar的样式变成黑色，怎么办？
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
}
14. 怎么把我的navigationbar弄成透明的而不是带模糊的效果？
[self.navigationBar setBackgroundImage:[UIImage new]
forBarMetrics:UIBarMetricsDefault];
self.navigationBar.shadowImage = [UIImage new];
self.navigationBar.translucent = YES;
15. 怎么改变uitextfield placeholder的颜色和位置？
继承uitextfield，重写这个方法
- (void) drawPlaceholderInRect:(CGRect)rect {
[[UIColor blueColor] setFill];
[self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UILineBreakModeTailTruncation alignment:self.textAlignment];
}
16. 遇到了二进制颜色，怎么办呢？
#define UIColorFromRGBValue(rgbValue) [UIColor colorWithRed:((CGFloat)(rgbValue & 0xFF0000) << 16) / 255 green:((CGFloat)(rgbValue & 0xFF00) << 8) / 255 blue:((CGFloat)(rgbValue) << 0xFF) / 255 alpha:1.0]
