小编Sco*_*rie的帖子

我想运行QML组件列表并选择一种类型:

for (var i = 0; i < controls.children.length; ++i) {
     if ( typeof (controls.children[i].height) == "QDeclarativeRectangle")
     {
        // do stuff
     }
}

如何实现这一目标？

我正在向NSData添加一个类别,如下所示:

// PacketCategories.h
@interface NSData(PacketSplit)
  - (NSArray *)splitTransferredPackets:(NSData **)leftover;
@end

// PacketCategories.m
@implementation NSData(PacketSplit)
- (NSArray *)splitTransferredPackets:(NSData **)leftover {

    NSMutableArray *ret = [NSMutableArray array];
    const unsigned char *beginning = [self bytes];
    const unsigned char *offset = [self bytes];
    NSInteger bytesEnd = (NSInteger)offset + [self length];

    while ((NSInteger)offset < bytesEnd) {
        uint64_t dataSize[1];
        NSInteger dataSizeStart = offset - beginning;
        NSInteger dataStart = dataSizeStart + sizeof(uint64_t);

        NSRange headerRange = NSMakeRange(dataSizeStart, sizeof(uint64_t));
        [self getBytes:dataSize range:headerRange];


        if (dataStart + dataSize[0] + (NSInteger)offset > bytesEnd) …