在trigger.io中更改默认启动设备(Change default startup device in trigger.io)

 改变这个： 
 
- (NSData *)extractFloatArrayFromElement:(TBXMLElement *)element
{
    // element is <source>
    NSMutableData *floatData = [NSMutableData data];
    TBXMLElement *floatElement = [TBXML childElementNamed:@"float_array" parentElement:element];
    NSString *stringValues = [TBXML textForElement:floatElement];

    NSArray *values = [stringValues componentsSeparatedByString:@" "];
    for (NSString *value in values) {
        float floatValue = [value floatValue];
        [floatData appendBytes:&floatValue length:sizeof(floatValue)];
    }

    return floatData;
}
 
 对此： 
 
- (NSData *)extractFloatArrayFromElement:(TBXMLElement *)element
{
@autoreleasepool {
    // element is <source>
    NSMutableData *floatData = [NSMutableData data];
    TBXMLElement *floatElement = [TBXML childElementNamed:@"float_array" parentElement:element];
    NSString *stringValues = [TBXML textForElement:floatElement];

    NSArray *values = [stringValues componentsSeparatedByString:@" "];
    for (NSString *value in values) {
        float floatValue = [value floatValue];
        [floatData appendBytes:&floatValue length:sizeof(floatValue)];
    }

    return floatData;
}
}
 
 这假设componentsSeparatedByString:是大量自动释放对象的来源。 如果这没有帮助，那么： 
 
 
 
 按字节数对分配工具中的报告进行排序 
 
 
 打开“仅跟踪活动对象”（或其他任何名称） 
 
 
 打开“跟踪引用计数事件” 
 
 
 单击对象，然后单击以创建单个对象 
 
 
 这应该告诉你代码中触发分配的内容。 从那里，这是一个使内存使用更有效的问题。 

Change this:
 
- (NSData *)extractFloatArrayFromElement:(TBXMLElement *)element
{
    // element is <source>
    NSMutableData *floatData = [NSMutableData data];
    TBXMLElement *floatElement = [TBXML childElementNamed:@"float_array" parentElement:element];
    NSString *stringValues = [TBXML textForElement:floatElement];

    NSArray *values = [stringValues componentsSeparatedByString:@" "];
    for (NSString *value in values) {
        float floatValue = [value floatValue];
        [floatData appendBytes:&floatValue length:sizeof(floatValue)];
    }

    return floatData;
}
 
To this:
 
- (NSData *)extractFloatArrayFromElement:(TBXMLElement *)element
{
@autoreleasepool {
    // element is <source>
    NSMutableData *floatData = [NSMutableData data];
    TBXMLElement *floatElement = [TBXML childElementNamed:@"float_array" parentElement:element];
    NSString *stringValues = [TBXML textForElement:floatElement];

    NSArray *values = [stringValues componentsSeparatedByString:@" "];
    for (NSString *value in values) {
        float floatValue = [value floatValue];
        [floatData appendBytes:&floatValue length:sizeof(floatValue)];
    }

    return floatData;
}
}
 
This assumes that componentsSeparatedByString: is the source of a ton of autoreleased objects. If that doesn't help, then:
 
 
 
sort the report in the Allocations Instrument by # of bytes
 
 
turn on "only track live objects" (or whatever it is called)
 
 
turn on "track reference count events"
 
 
click through to the objects and then click through to the creation of a single object
 
 
That should tell you what in your code is triggering the allocation. From there, it is a matter of making the memory usage more efficient.