分享一下容易忽视的一些小技巧
1.让tableView不显示空的单元格:
self.tableView.tableFooterView = [UIView alloc] init];
2.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;
3.ScrollView莫名其妙不能在viewController划到顶怎么办?
self.automaticallyAdjustsScrollViewInsets = NO;
4.隐藏导航条navigationBar
self.navigationController.hidesBarsOnSwipe = YES;
5.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;
6.怎么改变uitextfield placeholder的颜色和位置？
- (void) drawPlaceholderInRect:(CGRect)rect {
[[UIColor blueColor] setFill];
[self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UILineBreakModeTailTruncation alignment:self.textAlignment];
}
7.当拖动tableView时,键盘回收
self.tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
8.button 的title左右上下对齐
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
[button setTitleEdgeInsets:UIEdgeInsetsMake(0, 10, 18, 0)];
9.改变视图的透明度，不改变子视图
self.backgroundColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.5];
