网址:edu.51CTO.com 不可不知的:iOS
开发的22个诡异技巧
结合自身的实践开发经验总结出了22个iOS开发的小技巧,以非常欢乐的语调轻松解决开发过程中所遇到的各种苦逼难题,光读着便已忍俊不禁。
1. TableView不显示没内容的Cell怎么办?
类似于图1,我不想让下面的那些空显示。很简单,添加
“self.tableView.tableFooterView = [[UIViewalloc] init];”试过都说好,加完这句之后就变成了图2的样子。
2. 自定义了leftBarbuttonItem左滑返回手势失效了怎么办?
1. self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
2. initWithImage:img
3. style:UIBarButtonItemStylePlain
4. target:self
5. action:@selector(onBack:)];
6. self.navigationController.interactivePopGestureRecognizer.delegate =
(id<UIGestureRecognizerDelegate>)self;
3. ScrollView莫名其妙不能在viewController划到顶怎么办?
1. self.automaticallyAdjustsScrollViewInsets = NO;
4. 键盘事件写得好烦躁,都想摔键盘了怎么办?
买个结实的键盘; 网址:edu.51CTO.com
使用IQKeyboardManager(GitHub上可搜索),用完之后腰也不疼了,腿也不酸了。
5. 为什么我的App老是不流畅,到底哪里出了问题?
如图:
这个神器叫做:KMCGeigerCounter ,快去GitHub上搬运吧。
6. 怎么在不新建一个Cell的情况下调整separaLine的位置?
1. _myTableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);
7. 怎么点击self.view就让键盘收起,需要添加一个tapGestures么?
1. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
2. {
3. [self.view endEditing:YES];
4. }
8. 怎么给每个ViewController设定默认的背景图片?
使用基类啊,少年。
9. 想在代码里改在xib里添加的layoutAttributes,但该怎么用代码找? 像拉Button一样地拉你的约束,nslayoutattribute也是可以拉线的。
1. navigationController.hidesBarsOnSwipe = Yes
11. 导航条返回键带的title太讨厌了,怎么让它消失?
1. [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UI
OffsetMake(0, -60)
2. forBarMetrics:UIBarMetricsDefault]; 12. CoreData用起来好烦,语法又臭又长怎么办?
MagicRecord
13. CollectionView怎么实现tableview那种悬停的header?
CSStickyHeaderFlowLayout
14. 能不能只用一个pan手势来代替UISwipegesture的各个方向?
1. - (void)pan:(UIPanGestureRecognizer *)sender
2. {
3. typedef NS_ENUM(NSUInteger, UIPanGestureRecognizerDirection) {
4. UIPanGestureRecognizerDirectionUndefined,
5. UIPanGestureRecognizerDirectionUp,
6. UIPanGestureRecognizerDirectionDown,
7. UIPanGestureRecognizerDirectionLeft,
8. UIPanGestureRecognizerDirectionRight
9. };
10. static UIPanGestureRecognizerDirection direction = UIPanGestureRecogn
izerDirectionUndefined;
11. switch (sender.state) {
12. case UIGestureRecognizerStateBegan: {
13. if (direction == UIPanGestureRecognizerDirectionUndefined) {
14. CGPoint velocity = [sender velocityInView:recognizer.view];
15. BOOL isVerticalGesture = fabs(velocity.y) > fabs(velocity.x);
16. if (isVerticalGesture) {
17. if (velocity.y > 0) {
18. direction = UIPanGestureRecognizerDirectionDown;
19. } else {
20. direction = UIPanGestureRecognizerDirectionUp;
21. }
22. }
23. else {
24. if (velocity.x > 0) { 网址:edu.51CTO.com
25. direction = UIPanGestureRecognizerDirectionRight;
26. } else {
27. direction = UIPanGestureRecognizerDirectionLeft;
28. }
29. }
30. }
31. break;
32. }
33. case UIGestureRecognizerStateChanged: {
34. switch (direction) {
35. case UIPanGestureRecognizerDirectionUp: {
36. [self handleUpwardsGesture:sender];
37. break;
38. }
39. case UIPanGestureRecognizerDirectionDown: {
40. [self handleDownwardsGesture:sender];
41. break;
42. }
43. case UIPanGestureRecognizerDirectionLeft: {
44. [self handleLeftGesture:sender];
45. break;
46. }
47. case UIPanGestureRecognizerDirectionRight: {
48. [self handleRightGesture:sender];
49. break;
50. }
51. default: {
52. break;
53. }
54. }
55. break;
56. }
57. case UIGestureRecognizerStateEnded: {
58. direction = UIPanGestureRecognizerDirectionUndefined;
59. break;
60. }
61. default:
62. break;
63. }
64. }
15. 拉伸图片的时候怎么才能让图片不变形?
1. UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLef
tCapWidth:10 topCapHeight:10]; 注:有开发者提醒这个已经弃用,现在的方法叫resizableImageWithCapInsets。 方法二,如图:
16. 怎么播放GIF的时候这么卡,有没有好点的库?
FlipBoard出品的FLAnimatedImage太适合你了。
17. 怎么一句话添加上拉刷新?
使用SVPullToRefresh库:
1. [tableView addPullToRefreshWithActionHandler:^{
2. // prepend data to dataSource, insert cells at top of table view
3. // call [tableView.pullToRefreshView stopAnimating] when done
4. } position:SVPullToRefreshPositionBottom];
18. 怎么把tableview里Cell的小对勾颜色改成别的颜色?
1. _mTableView.tintColor = [UIColor redColor];
网址:edu.51CTO.com
19. 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?
1. - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
2. {
3. [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyle
LightContent];
4. }
20. 怎么把我的navigationbar弄成透明的而不是带模糊的效果?
1. [self.navigationBar setBackgroundImage:[UIImage new]
2. forBarMetrics:UIBarMetricsDefault]; 3. self.navigationBar.shadowImage = [UIImage new];
4. self.navigationBar.translucent = YES;
21. 怎么改变uitextfield placeholder的颜色和位置?
继承uitextfield,重写这个方法:
1. - (void) drawPlaceholderInRect:(CGRect)rect {
2. [[UIColor blueColor] setFill];
3. [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UI
LineBreakModeTailTruncation alignment:self.textAlignment];
4. }
22. 你为什么知道这么多奇怪的花招?
去Stack Overflow刷问题啊,少年!
iOS开发的22个诡异技巧
结合自身的实践开发经验总结出了22个iOS开发的小技巧,以非常欢乐的语调轻松解决开发过程中所遇到的各种苦逼难题,光读着便已忍俊不禁。
1. TableView不显示没内容的Cell怎么办?
类似于图1,我不想让下面的那些空显示。很简单,添加“self.tableView.tableFooterView =
[[UIView alloc] init];”试过都说好,加完这句之后就变成了图2的样子。
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<UIGestureRecognizerDelegate>)self;
3. ScrollView莫名其妙不能在viewController划到顶怎么办?
self.automaticallyAdjustsScrollViewInsets = NO;
4. 键盘事件写得好烦躁,都想摔键盘了怎么办?
买个结实的键盘;
使用IQKeyboardManager(GitHub上可搜索),用完之后腰也不疼了,腿也不酸了。
5. 为什么我的App老是不流畅,到底哪里出了问题?
如图:
这个神器叫做:KMCGeigerCounter ,快去GitHub上搬运吧。
6. 怎么在不新建一个Cell的情况下调整separaLine的位置?
_myTableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);
7. 怎么点击self.view就让键盘收起,需要添加一个tapGestures么?
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self.view endEditing:YES];
}
8. 怎么给每个ViewController设定默认的背景图片?
使用基类啊,少年。
9. 想在代码里改在xib里添加的layoutAttributes,但该怎么用代码找?
像拉Button一样地拉你的约束,nslayoutattribute也是可以拉线的。
10. 怎么像Safari一样滑动的时候隐藏navigationbar?
navigationController.hidesBarsOnSwipe = Yes
11. 导航条返回键带的title太讨厌了,怎么让它消失?
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
forBarMetrics:UIBarMetricsDefault];
12. CoreData用起来好烦,语法又臭又长怎么办?
MagicRecord
13. CollectionView怎么实现tableview那种悬停的header?
CSStickyHeaderFlowLayout
14. 能不能只用一个pan手势来代替UISwipegesture的各个方向?
- (void)pan:(UIPanGestureRecognizer *)sender
{
typedef NS_ENUM(NSUInteger, UIPanGestureRecognizerDirection) { UIPanGestureRecognizerDirectionUndefined,
UIPanGestureRecognizerDirectionUp,
UIPanGestureRecognizerDirectionDown,
UIPanGestureRecognizerDirectionLeft,
UIPanGestureRecognizerDirectionRight
};
static UIPanGestureRecognizerDirection direction = UIPanGestureRecognizerDirectionUndefined;
switch (sender.state) {
case UIGestureRecognizerStateBegan: {
if (direction == UIPanGestureRecognizerDirectionUndefined) { CGPoint velocity = [sender velocityInView:recognizer.view]; BOOL isVerticalGesture = fabs(velocity.y) > fabs(velocity.x); if (isVerticalGesture) {
if (velocity.y > 0) {
direction = UIPanGestureRecognizerDirectionDown;
} else {
direction = UIPanGestureRecognizerDirectionUp;
}
}
else {
if (velocity.x > 0) {
direction = UIPanGestureRecognizerDirectionRight;
} else {
direction = UIPanGestureRecognizerDirectionLeft;
}
}
}
break;
}
case UIGestureRecognizerStateChanged: {
switch (direction) {
case UIPanGestureRecognizerDirectionUp: {
[self handleUpwardsGesture:sender];
break;
}
case UIPanGestureRecognizerDirectionDown: {
[self handleDownwardsGesture:sender];
break;
}
case UIPanGestureRecognizerDirectionLeft: {
[self handleLeftGesture:sender];
break;
}
case UIPanGestureRecognizerDirectionRight: {
[self handleRightGesture:sender];
break;
}
default: {
break;
}
}
break;
}
case UIGestureRecognizerStateEnded: {
direction = UIPanGestureRecognizerDirectionUndefined;
break;
}
default:
break;
}
}
15. 拉伸图片的时候怎么才能让图片不变形?
方法一:
UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth:10 topCapHeight:10];
注:有开发者提醒这个已经弃用,现在的方法叫resizableImageWithCapInsets。 方法二,如图:
16. 怎么播放GIF的时候这么卡,有没有好点的库?
FlipBoard出品的FLAnimatedImage太适合你了。
17. 怎么一句话添加上拉刷新?
使用SVPullToRefresh库:
[tableView addPullToRefreshWithActionHandler:^{
// prepend data to dataSource, insert cells at top of table view // call [tableView.pullToRefreshView stopAnimating] when done } position:SVPullToRefreshPositionBottom];
18. 怎么把tableview里Cell的小对勾颜色改成别的颜色?
_mTableView.tintColor = [UIColor redColor];
19. 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];
}
20. 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;
21. 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]; }
22. 你为什么知道这么多奇怪的花招?
去Stack Overflow刷问题啊,少年!
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