1、JSON解析
- (NSDictionary *)serializedData:(NSData *)data {
NSError *JSONSerializationError;
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&JSONSerializationError];
if(JSONSerializationError) {
[NSException raise:@"JSON Serialization Error" format:@"Failed to parse weather data"];
}
return JSON;
}
2、背景模糊，需要UIImage+ImageEffects
- (void)setBlurredOverlayImage {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
// Take a screen shot of this controller's view
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
[self.view.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// Blur the screen shot
UIImage *blurred = [image applyBlurWithRadius:20
tintColor:[UIColor colorWithWhite:0.15 alpha:0.5]
saturationDeltaFactor:1.5
maskImage:nil];
dispatch_async(dispatch_get_main_queue(), ^ {
// Set the blurred overlay view's image with the blurred screenshot
self.blurredOverlayView.image = blurred;
});
});
}
3、计算pageControl的页码
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
// Update the current page for the page control
float fractionalPage = self.pagingScrollView.contentOffset.x / self.pagingScrollView.frame.size.width;
self.pageControl.currentPage = lround(fractionalPage);
}
4、图像缩放
+ (UIImage *)scale:(UIImage *)sourceImg toSize:(CGSize)size {
UIGraphicsBeginImageContext(size);
[sourceImg drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return scaledImage;
}
+ (CGSize)scaleSize:(CGSize)sourceSize {
float width = sourceSize.width;
float height = sourceSize.height;
if (width >= height)
return CGSizeMake(800, 800 * height / width);
else
return CGSizeMake(800 * width / height, 800);
}
5、ASIHTTPRequest取消请求
+ (void)CancelRequest:(ASIHTTPRequest *)request {
if (request != nil) {
[request cancel];
[request clearDelegatesAndCancel];
}
}
6、debug log switch
#ifdef DEBUG
# define NSLog(...) NSLog(__VA_ARGS__)
#else
# define NSLog(...) {}
#endif
7、Disk cache
NSURLCache *URLCache = [[NSURLCache alloc] initWithMemoryCapacity:4 * 1024 * 1024
diskCapacity:20 * 1024 * 1024
diskPath:nil];
[NSURLCache setSharedURLCache:URLCache];
8、AFNetworking
[[AFNetworkActivityIndicatorManager sharedManager] setEnabled:YES];
[[AFNetworkReachabilityManager sharedManager] startMonitoring];
[[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
NSString* title = @"网络未连接";
switch (status) {
case AFNetworkReachabilityStatusNotReachable:
title = @"网络未连接";
break;
case AFNetworkReachabilityStatusReachableViaWiFi:
title = @"当前wifi已连接";
break;
case AFNetworkReachabilityStatusReachableViaWWAN:
title = @"当前2g/3g已连接";
break;
default:
break;
}
[RCGlobalConfig HUDShowMessage:title addedToView:[UIApplication sharedApplication].keyWindow];
}];
9、MBProgressHUD
+ (MBProgressHUD *)HUDShowMessage:(NSString *)msg addedToView:(UIView *)view {
static MBProgressHUD *hud = nil;
if (!hud)
hud = [MBProgressHUD showHUDAddedTo:view animated:YES];
hud.mode = MBProgressHUDModeText;
hud.labelText = msg;
hud.hidden = NO;
hud.alpha = 1.0f;
[hud hide:YES afterDelay:1.0f];
return hud;
}
10、UIBarButtonItem
+ (UIBarButtonItem *)createBarButtonItemWithTitle:(NSString *)buttonTitle Target:(id)target action:(SEL)action {
UIBarButtonItem *item = nil;
item = [[UIBarButtonItem alloc] initWithTitle:buttonTitle
style:UIBarButtonItemStylePlain
target:target
action:action];
return item;
}
+ (UIBarButtonItem *)createMenuBarButtonItemWithTarget:(id)target action:(SEL)action {
return [[UIBarButtonItem alloc] initWithImage:[UIImage nimbusImageNamed:@"icon_menu.png"]
style:UIBarButtonItemStylePlain
target:target action:action];
}
+ (UIBarButtonItem *)createRefreshBarButtonItemWithTarget:(id)target action:(SEL)action {
UIBarButtonItem *item = nil;
item = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
target:target action:action];
return item;
}
11、获取UIView对应的UIViewController
#import <UIKit/UIKit.h>
@interface UIView (findViewController)
- (UIViewController *)viewController;
@end
#import "UIView+findViewController.h"
@implementation UIView (findViewController)
- (UIViewController *)viewController {
// Traverse responder chain. Return first found view controller, which will be the view's view controller.
UIResponder *responder = self;
while ((responder = [responder nextResponder]))
if ([responder isKindOfClass:[UIViewController class]])
return (UIViewController *)responder;
// If the view controller isn't found, return nil.
return nil;
}
@end
12、获取图片，需要nimbus
#import <UIKit/UIKit.h>
@interface UIImage (nimbusImageNamed)
+ (UIImage *)nimbusImageNamed:(NSString *)imageName;
@end
#import "UIImage+nimbusImageNamed.h"
@implementation UIImage (nimbusImageNamed)
+ (UIImage *)nimbusImageNamed:(NSString *)imageName {
NSString *imagePath = NIPathForBundleResource(nil, imageName);
UIImage *image = [[Nimbus imageMemoryCache] objectWithName:imagePath];
if (nil == image) {
image = [UIImage imageWithContentsOfFile:imagePath];
// store it in memory
[[Nimbus imageMemoryCache] storeObject:image withName:imagePath];
}
return image;
}
@end
13、保存图片
if(photoView.image) UIImageWriteToSavedPhotosAlbum(photoView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
14、获取文件内容
+ (NSString *)contentForFile:(NSString *)file ofType:(NSString *)type {
NSString *filePath=[[NSBundle mainBundle] pathForResource:file ofType:type];
NSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
return content;
}
15、获取AppDelegate
+ (SFAppDelegate *)applicationDelegate {
return (SFAppDelegate *)[[UIApplication sharedApplication] delegate];
}
16、计算字符高度
+ (float)heightOfString:(NSString *)string withWidth:(float)width font:(UIFont *)font {
if ([NSNull null] == (id)string)
string = @"暂时没有数据";
CGSize constraintSize = CGSizeMake(width, MAXFLOAT);
CGSize labelSize = [string sizeWithFont:font constrainedToSize:constraintSize lineBreakMode:UILineBreakModeWordWrap];
return labelSize.height;
}
17、设置cookie
NSHTTPCookie *uidCookie = [NSHTTPCookie cookieWithProperties:
[NSDictionary dictionaryWithObjectsAndKeys:
@"sfuid", NSHTTPCookieName,
@"", NSHTTPCookieValue,
@".segmentfault.com", NSHTTPCookieDomain,
@"segmentfault.com", NSHTTPCookieOriginURL,
@"/", NSHTTPCookiePath,
@"0", NSHTTPCookieVersion,
nil]];
[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:uidCookie];