ios常用的代码片段（snippet）

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1，判断字符串是否为空：

#pragma     mark  -#pragma     mark  判断字符串是否为空-(Boolean) isEmptyOrNull:(NSString *) str {    if (!str) {        // null object        return true;    } else {        NSString *trimedString = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];        if ([trimedString length] == 0) {            // empty string            return true;        } else {            // is neither empty nor null             return false;        }    }}

2，判断客户端是否使用了代理：

-(BOOL) hasUseProxySetting{    NSDictionary *proxySettings = NSMakeCollectable([(NSDictionary *)CFNetworkCopySystemProxySettings() autorelease]);    NSString *markString = [NSString stringWithString:@"doodoobird.com"];    NSString *proxyStringOne = [[[proxySettings objectForKey:@"__SCOPED__"]objectForKey:@"pdp_ip0"] objectForKey:@"HTTPProxy"];    if([proxyStringOne  rangeOfString:markString].length > 0){        self.isUseProxy = 1;    }else {        self.isUseProxy = 0;    }    self.localProxyFlag = self.isUseProxy;    if (self.isWWANNet) {                [[NSUserDefaults standardUserDefaults] setValue:self.localProxyFlag?@"1":@"0" forKey:@"proxy_flag"];        [[NSUserDefaults standardUserDefaults] synchronize];                        return self.isUseProxy;    }else {        if (self.isUseProxy == YES) {            [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"wifiDelegateValue"];        }        return self.isUseProxy || [[NSUserDefaults standardUserDefaults] boolForKey:@"wifiDelegateValue"];    }}

3，读取配置文件信息：

    //从配置文件中读取渠道号    // 取得文件路径    NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"config" ofType:@"plist"];    // 读取到一个NSDictionary    NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath];    NSString *channel = [dictionary objectForKey:@"channel"];    NSLog(@"channel is : %@",channel);