个人总结的一些 APP 的代码实践

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[UIApplication sharedApplication].delegate

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//APPHelper.h@interface APPHelper+ (APPHelper*)call;- (void) configureWindow:(UIWindow*)window;@property (nonatomic, readonly) AppDelegate *delegate;@property (strong, readonly) UIWindow *window;@end//APPHelper.m@interface APPHelper ()@end@implementation APPHelper- (id)init{    self = [super init];    if (self) {                _delegate = (GGAppDelegate*)[UIApplication sharedApplication].delegate;    }    return self;}+ (APPHelper *)call{    static dispatch_once_t  onceQueue;    static APPHelper *appInstance;    dispatch_once(&onceQueue, ^{        appInstance = [[APPHelper alloc] init];    });    return appInstance;}- (UIWindow *)window{    return self.delegate.window;}- (void)configureWindow:(UIWindow*)window{        UINavigationController *nav = [[UINavigationController alloc] init];    ...    ...    ...        window.rootViewController = nav;    }@end

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#import "AppHelper.h"#define APP ([APPHelper call])

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//设置APP为圆角APP.window.layer.cornerRadius = 5.0f;APP.window.layer.masksToBounds = YES;

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#define FlexibleT                   UIViewAutoresizingFlexibleTopMargin#define FlexibleB                   UIViewAutoresizingFlexibleBottomMargin#define FlexibleL                   UIViewAutoresizingFlexibleLeftMargin#define FlexibleR                   UIViewAutoresizingFlexibleRightMargin#define FlexibleH                   UIViewAutoresizingFlexibleHeight#define FlexibleW                   UIViewAutoresizingFlexibleWidth#define FixedMarginT                FlexibleW | FlexibleB#define FixedMarginB                FlexibleW | FlexibleT#define FixedMarginL                FlexibleH | FlexibleR#define FixedMarginR                FlexibleH | FlexibleL#define FixedHorizental             FlexibleW | FlexibleT | FlexibleB#define FixedVertical               FlexibleH | FlexibleL | FlexibleR#define FixedALL                    FlexibleW | FlexibleH#define FixedCenter                 FlexibleL | FlexibleR | FlexibleT | FlexibleB

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- (void) autoResize:(UIViewAutoresizing) type{    self.autoresizingMask = mask;    self.autoresizesSubviews = YES;}

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@implementation XXXViewController- (id)init{    self = [super init];    if (self) {        // Custom initialization                self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStyleGrouped];        **[self.tableView autoResize:FixedALL];**            self.tableView.delegate = self;        [self.view addSubview:self.tableView];                ...        ...    }    return self;}

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/////////////////////////////////////////  UIColor/////////////////////////////////////////通过RGBA值(比如红色FF0000FF)生成UIColor+ (UIColor* ) colorWithHex:(int)color {        float red = (color & 0xff000000) >> 24;    float green = (color & 0x00ff0000) >> 16;    float blue = (color & 0x0000ff00) >> 8;    float alpha = (color & 0x000000ff);        return [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:alpha/255.0];}/////////////////////////////////////////  UIImage/////////////////////////////////////////复制当前图片- (UIImage *)duplicate{    CGImageRef newCgIm = CGImageCreateCopy(self.CGImage);    UIImage *newImage = [UIImage imageWithCGImage:newCgIm scale:self.scale orientation:self.imageOrientation];    CGImageRelease(newCgIm);        return newImage;}//使当前图片可拉伸- (UIImage *)stretched{    CGSize size = self.size;        UIEdgeInsets insets = UIEdgeInsetsMake(truncf(size.height-1)/2, truncf(size.width-1)/2, truncf(size.height-1)/2, truncf(size.width-1)/2);        return [self resizableImageWithCapInsets:insets];}//使当前图片抗锯齿(当图片在旋转时有用, 原理就是在图片周围加1px的透明像素)- (UIImage *)antiAlias{    int border = 1;    CGRect rect = CGRectMake(border, border, self.size.width-2*border, self.size.height-2*border);        UIImage *img = nil;        UIGraphicsBeginImageContext(CGSizeMake(rect.size.width,rect.size.height));    [self drawInRect:CGRectMake(-1, -1, self.size.width, self.size.height)];    img = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();        UIGraphicsBeginImageContext(self.size);    [img drawInRect:rect];    UIImage* antiImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();        return antiImage;}//创建纯色的图片+ (UIImage *)imageWithColor:(UIColor *)color Size:(CGSize)size{    CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);    UIGraphicsBeginImageContext(rect.size);    CGContextRef context = UIGraphicsGetCurrentContext();        CGContextSetFillColorWithColor(context, [color CGColor]);    CGContextFillRect(context, rect);        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();        return [image stretched];}//imageNamed的非缓存版+ (UIImage *)imageName:(NSString *)name{    NSString *path = [[[NSBundle mainBundle] bundlePath] stringByAppendingString:[NSString stringWithFormat:@"/%@",name]];        return [UIImage imageWithContentsOfFile:path];}/////////////////////////////////////////  UIButton///////////////////////////////////////- (float)x{    return self.frame.origin.x;}- (float)y{    return self.frame.origin.y;}- (float)w{    return self.frame.size.width;}- (float)h{    return self.frame.size.height;}- (void)setTagName:(NSString*)name{    self.tag = [name hash];}- (UIView *)viewWithName:(NSString *)name{    return [self viewWithTag:[name hash]];}- (void) autoResize:(UIViewAutoresizing)mask{    self.autoresizingMask = mask;    self.autoresizesSubviews = YES;}- (void)setPosition:(CGRect)position{    self.bounds = CGRectMake(0, 0, position.size.width, position.size.height);    self.center = CGPointMake(position.origin.x,position.origin.y);}/////////////////////////////////////////  UIButton///////////////////////////////////////+ (UIButton*) buttonWithTarget:(id)target action:(SEL)sel{    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];    [btn addTarget:target action:sel forControlEvents:UIControlEventTouchUpInside];    return btn;}- (void) setTextN:(NSString*)n H:(NSString*)h D:(NSString*)d S:(NSString *)s{    if ( n )    {        [self setTitle:n forState:UIControlStateNormal];    }        if ( h )    {        [self setTitle:h forState:UIControlStateHighlighted];    }        if ( d )    {        [self setTitle:d forState:UIControlStateDisabled];    }        if ( s )    {        [self setTitle:s forState:UIControlStateSelected];    }}- (void) setImageN:(NSString*)n H:(NSString*)h D:(NSString*)d S:(NSString *)s{    if ( n )    {        [self setImage:[UIImage imageName:n] forState:UIControlStateNormal];    }        if ( h )    {        [self setImage:[UIImage imageName:h] forState:UIControlStateHighlighted];    }        if ( d )    {        [self setImage:[UIImage imageName:d] forState:UIControlStateDisabled];    }        if ( s )    {        [self setImage:[UIImage imageName:s] forState:UIControlStateSelected];                if ( h )        {            [self setImage:[UIImage imageName:h] forState:UIControlStateHighlighted | UIControlStateSelected];        }            }}/////////////////////////////////////////  NSString///////////////////////////////////////-(NSString *) trimHead{    NSInteger i;    NSCharacterSet *cs = [NSCharacterSet whitespaceAndNewlineCharacterSet];    for(i = 0; i < [self length]; i++)    {        if ( ![cs characterIsMember: [self characterAtIndex: i]] ) break;    }    return [self substringFromIndex: i];}-(NSString *) trimTail{    NSInteger i;    NSCharacterSet *cs = [NSCharacterSet whitespaceAndNewlineCharacterSet];    for(i = [self length] -1; i >= 0; i--)    {        if ( ![cs characterIsMember: [self characterAtIndex: i]] ) break;        }    return [self substringToIndex: (i+1)];}- (NSString *) trimBoth{    return [[self trimHead] trimTail];}- (NSString*)MD5{    const char *ptr = [self UTF8String];        unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH];        CC_MD5(ptr, strlen(ptr), md5Buffer);        NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];    for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)         [output appendFormat:@"%02x",md5Buffer[i]];        return output;}- (BOOL)equals:(NSString *)str{    return [self compare:str] == NSOrderedSame;}- (CGFloat)heightByFont:(UIFont *)font width:(CGFloat)width{    return [self sizeWithFont:font            constrainedToSize:CGSizeMake(width, CGFLOAT_MAX)                lineBreakMode:NSLineBreakByWordWrapping].height;}/////////////////////////////////////////  NSDictionary/////////////////////////////////////////使取得的值不会使NSNull,在JSON解析的时候会有这种问题,有时候服务器返回了 {"test":null},但是被解析成了NSNull,这时APP这边处理起来会比较麻烦- (id)objectForKeyNotNull:(id)key {    id object = [self objectForKey:key];    if (object == [NSNull null])        return nil;        return object;}/////////////////////////////////////////  NSAttributedString///////////////////////////////////////- (CGFloat)heightByWidth:(CGFloat)width{    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)self);    CGSize targetSize = CGSizeMake(width, CGFLOAT_MAX);    CGSize fitSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0, [self length]), NULL, targetSize, NULL);    CFRelease(framesetter);        return fitSize.height;}