iOS開發小知識

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不是什麼非常高深的知識、只是記載開發中用到過的一些小技巧。隨時更新！

 

1、UILabel根據文字數量確定其Frame

//定義UILable寬度最大值CGFloat contentMaxW = 300;//擷取UILabel的Size，注意傳入的Font大小要與UILabel的的Font大小保持相同CGSize contentSize = [content boundingRectWithSize:CGSizeMake(contentMaxW, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]} context:nil].size;//注意要設定UILable的numberOfLines屬性為0，才能顯示多行文字contentLabel.numberOfLines = 0;

 2、UILabel顯示HTML代碼字串

NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[htmlstr dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];contentLabel.attributedText = attrStr;

 3、使用AFN封裝網路層

AFN非常優秀的HTTP網路架構，一般在項目中我們會在其基礎上封裝網路層。在這一層處理傳入的url和參數，例如資料加密。

//YQHttpTool.h+ (void)post:(NSString *)url params:(NSDictionary *)params success:(void (^)(id json))success failure:(void (^)(NSError *error))failure;+ (void)get:(NSString *)url params:(NSDictionary *)params success:(void (^)(id json))success failure:(void (^)(NSError *error))failure; //YQHttpTools.m+ (void)post:(NSString *)url params:(NSDictionary *)params auth:(NSDictionary *)auth success:(void (^)(id))success failure:(void (^)(NSError *))failure{   AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager];   mgr.responseSerializer = [AFHTTPResponseSerializer serializer];   [mgr POST:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {       if(success){           success(responseObject);       }   } failure:^(AFHTTPRequestOperation *operation, NSError *error) {       if(failure){           failure(error);       }   }];} 
+ (void)get:(NSString *)url params:(NSDictionary *)params success:(void (^)(id))success failure:(void (^)(NSError *))failure{    AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager];    mgr.responseSerializer = [AFHTTPResponseSerializer serializer];    [mgr GET:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {        if(success){            success(responseObject);        }    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {        if(failure){            failure(error);        }    }];}

 4、檢查更新

//appID為應用的appid，建議定義成宏define appID @"xxxxxxxxx"- (void)checkUpdate{    NSString *url = [NSString stringWithFormat:@"https://itunes.apple.com/lookup?id=%@", appID];    [YQHttpTool getWithURL:url params:nil  success:^(id json) {        id jsonObject = [NSJSONSerialization JSONObjectWithData:json options:NSJSONReadingAllowFragments error:nil];        if ([jsonObject isKindOfClass:[NSDictionary class]]) {            NSDictionary *dic = jsonObject;            if (nil != dic) {                NSArray *result_array = [dic objectForKey:@"results"];                if (nil != result_array && [result_array count] != 0) {                    NSDictionary *result_dic = [result_array objectAtIndex:0];                    if (nil != result_dic) {                        NSString *version = [result_dic objectForKey:@"version"];                        NSString *releaseNotes = [result_dic objectForKey:@"releaseNotes"];                        NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Info" ofType:@"plist"];                        NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithContentsOfFile: filePath];                        NSString *oldVersion = [dict objectForKey: @"CFBundleShortVersionString"];                        if ([version compare:oldVersion options:NSNumericSearch] == NSOrderedDescending) {                            UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"升級提示"                                                                         message:releaseNotes                                                                        delegate:self       //委託給Self，才會執行上面的調用                                                               cancelButtonTitle:@"以後再說"                                                               otherButtonTitles:@"馬上更新",nil];                            [av show];                        }                    }                }            }        }    } failure:^(NSError *error) {            }];}
//遵循<UIAlertView>

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {

    if (buttonIndex != [alertView cancelButtonIndex])

    {

        NSString *str = [NSString stringWithFormat:@"itms-apps://itunes.apple.com/app/id%@?mt=8", appID];

        NSURL *url = [NSURL URLWithString:str];

        [[UIApplication sharedApplication] openURL:url];

    }

}

 

iOS開發小知識