我正在使用AFHTTPRequestOperationManager(2.0 AFNetworking库)来发送REST POST请求.但是经理只有调用来设置参数.
-((AFHTTPRequestOperation *)POST:(NSString *)URLString
parameters:(NSDictionary *)parameters
success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
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我还需要用字符串设置HTTP请求体.我怎么能用AFHTTPRequestOperationManager来做呢?谢谢.
我设置:
cell.selectionStyle = UITableViewCellSelectionStyleGray;
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并使用代码突出显示一行:
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection: 0];
[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone
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即使我设置为灰色,高光颜色始终为蓝色.如果我设置:
cell.selectionStyle = UITableViewCellSelectionStyleNone;
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它工作正常,没有突出显示.但是不能合作:
cell.selectionStyle = UITableViewCellSelectionStyleGray;
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它只显示蓝色而不是灰色.任何的想法?谢谢.
迁移到ARC时出现上述错误.这是代码:
static NSString *cashBalanceKeyPath = @"test";
...
[xxx forKeyPath:cashBalanceKeyPath options:NSKeyValueObservingOptionNew context:&cashBalanceKeyPath];
...
-(void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context {
if (&cashBalanceKeyPath == context) < error here
{
...
}
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当我用桥时:
if (&cashBalanceKeyPath == (__bridge NSString *)context)
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我收到了错误: Comparison of distinct pointer types (NSString *__strong* and NSString *)
我怎样才能进行转换?提前致谢.
当您将对象添加到集合中(例如)时NSMutableArray,对象是否被复制(即值语义)或被保留(即引用语义)?
我对示例感到困惑:
NSMutableString *testStr = [@"test" mutableCopy];
NSMutableArray *arrayA = [[NSMutableArray alloc] init];
[arrayA addObject:testStr];
NSLog(@"%@", arrayA); // output: test
testStr = [@"world" mutableCopy];
NSLog(@"%@", arrayA); // output: test
// testStr is copied - value semantics
NSMutableArray *testArr = [@[@1, @2] mutableCopy];
NSMutableArray *arrarB = [[NSMutableArray alloc] init];
[arrarB addObject:testArr];
NSLog(@"%@", arrarB); // output: [1, 2]
[testArr addObject:@3];
NSLog(@"%@", arrarB); // output: [1, 2, 3]
// testArr is retained - reference semantics
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您可以看到:如果对象是NSMutableString,则看起来对象已被复制-您更改对象将不会影响数组中的对象。
但是,如果对象是NSMutableArray,则在更改对象时,数组中的对象也会更改-就像保留对象或通过引用传递一样。 …
我不确定如何初始化Objective-C类中的各种属性.请假设我在你的答案中是Objective-C的新用户......
我有以下课程:
考试班
@interface Test : NSObject
@property (nonatomic, strong) NSString *name;
@end
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TestManager类
@interface TestManager : NSObject
@property (nonatomic, strong) NSMutableArray *tests; // array of Test objects (array size unknown until runtime)
@end
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控制器类
@interface TestController : NSObject
@property (nonatomic, strong) TestManager *aManager;
-(void)initManager;
-(void)doSomething;
@end
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我想要一个像initManager被调用的方法:
-(void)initManager
{
// how can I init the aManager which will have an array of Test objects
}
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它将自动分配一个对象数组,以存储在manager类中,这样我就可以执行以下操作:
-(void)doSomething
{
NSString *name = ((Test *)[self.aManager.tests objectAtIndex:0]).name;
}
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我甚至不确定initManager是否是正确的使用方法 - …