iOS开发常用的代码

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本文汇总了iOS开发中UI实现的各种技巧，包括切换tab bar、自定义视图切换动画、计算字符串长度、清除UISearchBar背景及UIImageView图像缓存等。

string = [[array valueForKey:@"description"]

componentsJoinedByString:@","];

17. TabController

随意切换

tab bar

：

[self.tabBarController setSelectedIndex:tabIndex];

或者

self.tabBarController.selectedIndex = tabIndex;

或者实现下面的

delegate

来扑捉

tab bar

的事件：

代码

-(BOOL) tabBarController:(UITabBarController *)tabBarController

shouldSelectViewController:(UIViewController *)viewController

{

if ([viewController.tabBarItem.title isEqualToString:

NSLocalizedString(@"Logout",nil)])

{

[self showLogout];

return NO;

}

return YES;}

18.

自定义

View

之间切换动画：

代码

- (void) pushController: (UIViewController*) controller

withTransition: (UIViewAnimationTransition) transition

{

[UIView beginAnimations:nil context:NULL];

[self pushViewController:controller animated:NO];

[UIView setAnimationDuration:.5];

[UIView setAnimationBeginsFromCurrentState:YES];

[UIView setAnimationTransition:transition forView:self.view cache:YES];

[UIView commitAnimations];

}

CATransition *transition = [CATransition animation];

transition.duration = kAnimationDuration;

transition.timingFunction = [CAMediaTimingFunction

functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

transition.type = kCATransitionPush;

transition.subtype = kCATransitionFromTop;

transitioning = YES;

transition.delegate = self;

[self.navigationController.view.layer addAnimation:transition forKey:nil];

self.navigationController.navigationBarHidden = NO;

[self.navigationController pushViewController:tableViewController

animated:YES];

20.

计算字符串长度：

CGFloat w = [title sizeWithFont:[UIFont fontWithName:@"Arial"

size:18]].width;

23.

在使用

UISearchBar

时，将背景色设定为

clearColor

，或者将

translucent

设

为

YES

，

都不能使背景透明，

经过一番研究，

发现了一种超级简单和实用的方法：

[[searchbar.subviews objectAtIndex:0]removeFromSuperview];

背景完全消除了，只剩下搜索框本身了。

24.

图像与缓存

UIImageView *wallpaper = [[UIImageView alloc] initWithImage:

[UIImage imageNamed:@"icon.png"]]; //

会缓存图片

UIImageView *wallpaper = [[UIImageView alloc] initWithImage:

[UIImage imageWithContentsOfFile:@"icon.png"]]; //

不会缓存图片

25. iphone-

常用的对视图图层

(layer)

的操作

对图层的操作：

(1.

给图层添加背景图片：

myView.layer.contents = (id)[UIImage

imageNamed:@"view_BG.png"].CGImage;

(2.

将图层的边框设置为圆脚

myWebView.layer.cornerRadius = 8;

myWebView.layer.masksToBounds = YES;

(3.

给图层添加一个有色边框

myWebView.layer.borderWidth = 5;

myWebView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09

blue:0.07 alpha:1] CGColor];

将多个字符替换成空

NSCharacterSet *cs = [NSCharacterSet

characterSetWithCharactersInString:@"1234567890|"];

NSString

*resultstr

[[yourstr

componentsSeparatedByCharactersInSet:cs]

componentsJoinedByString:@" "];

string = [[array valueForKey:@"description"]

componentsJoinedByString:@","];

17. TabController

随意切换

tab bar

：

[self.tabBarController setSelectedIndex:tabIndex];

或者

self.tabBarController.selectedIndex = tabIndex;

或者实现下面的

delegate

来扑捉

tab bar

的事件：

代码

-(BOOL) tabBarController:(UITabBarController *)tabBarController

shouldSelectViewController:(UIViewController *)viewController

{

if ([viewController.tabBarItem.title isEqualToString:

NSLocalizedString(@"Logout",nil)])

{

[self showLogout];

return NO;

}

return YES;}

18.

自定义

View

之间切换动画：

代码

- (void) pushController: (UIViewController*) controller

withTransition: (UIViewAnimationTransition) transition

{

[UIView beginAnimations:nil context:NULL];

[self pushViewController:controller animated:NO];

[UIView setAnimationDuration:.5];

[UIView setAnimationBeginsFromCurrentState:YES];

[UIView setAnimationTransition:transition forView:self.view cache:YES];

[UIView commitAnimations];

}

CATransition *transition = [CATransition animation];

transition.duration = kAnimationDuration;

transition.timingFunction = [CAMediaTimingFunction

functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

transition.type = kCATransitionPush;

transition.subtype = kCATransitionFromTop;

transitioning = YES;

transition.delegate = self;

[self.navigationController.view.layer addAnimation:transition forKey:nil];

self.navigationController.navigationBarHidden = NO;

[self.navigationController pushViewController:tableViewController

animated:YES];

20.

计算字符串长度：

CGFloat w = [title sizeWithFont:[UIFont fontWithName:@"Arial"

size:18]].width;

23.

在使用

UISearchBar

时，将背景色设定为

clearColor

，或者将

translucent

设

为

YES

，

都不能使背景透明，

经过一番研究，

发现了一种超级简单和实用的方法：

[[searchbar.subviews objectAtIndex:0]removeFromSuperview];

背景完全消除了，只剩下搜索框本身了。

24.

图像与缓存

UIImageView *wallpaper = [[UIImageView alloc] initWithImage:

[UIImage imageNamed:@"icon.png"]]; //

会缓存图片

UIImageView *wallpaper = [[UIImageView alloc] initWithImage:

[UIImage imageWithContentsOfFile:@"icon.png"]]; //

不会缓存图片

25. iphone-

常用的对视图图层

(layer)

的操作

对图层的操作：

(1.

给图层添加背景图片：

myView.layer.contents = (id)[UIImage

imageNamed:@"view_BG.png"].CGImage;

(2.

将图层的边框设置为圆脚

myWebView.layer.cornerRadius = 8;

myWebView.layer.masksToBounds = YES;

(3.

给图层添加一个有色边框

myWebView.layer.borderWidth = 5;

myWebView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09

blue:0.07 alpha:1] CGColor];

将多个字符替换成空

NSCharacterSet *cs = [NSCharacterSet

characterSetWithCharactersInString:@"1234567890|"];

NSString

*resultstr

[[yourstr

componentsSeparatedByCharactersInSet:cs]

componentsJoinedByString:@" "];